Add smoke tests for UOM conversions and enhance frontend UOM management

- Implemented smoke tests for UOM directionality, ensuring conversions are one-directional and correctly validated.
- Added tests for receiving and selling items in different UOMs, verifying correct quantity handling and error responses.
- Created a UOM conversions panel in the frontend to allow users to manage UOM conversions for items.
- Introduced hooks for allowed UOMs to optimize fetching and caching of UOM data for document line forms.
- Developed utility functions for consistent UOM formatting and conversion handling across the application.

.gitignore

@@ -30,9 +30,13 @@ yarn-error.log*
 Thumbs.db
 .idea/
 
+# ── Playwright E2E (Testing/e2e) ──────────────────────────────────────
+Testing/e2e/playwright-report/
+Testing/e2e/test-results/
+Testing/e2e/.auth/
+Testing/e2e/blob-report/
+
 # ── Migrations ─────────────────────────────────────────────────────────
-# New EF Core migrations are not committed. Note the 4 migrations already in
-# Backend/ERPCore/Infra/Persistence/Migrations/ stay tracked — .gitignore does
-# not apply to tracked files — so edits to those still get committed as normal.
-# Untracking them too takes `git rm --cached`.
-**/Migrations/
+# Each dev keeps EF Core migrations local; DB schema changes are announced
+# to the team instead of committed, so migration files aren't shared here.
+Migrations/

Backend/ERPCore/Controllers/BundleSalesController.cs

@@ -0,0 +1,80 @@
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Sales;
+using ERPCore.Services.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ERPCore.Controllers;
+
+[Route("api/v1/bundle-sales")]
+public sealed class BundleSalesController : ApiControllerBase
+{
+    private readonly IBundleSaleService _bundles;
+
+    public BundleSalesController(IBundleSaleService bundles) => _bundles = bundles;
+
+    [HttpGet("templates")]
+    [ProducesResponseType(typeof(PagedResponse<BundleSaleTemplateSummaryDto>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<PagedResponse<BundleSaleTemplateSummaryDto>>> ListTemplates(
+        [FromQuery] PageQuery query,
+        CancellationToken ct)
+        => Ok(await _bundles.ListTemplatesAsync(query, ct));
+
+    [HttpGet("templates/{bundleSaleTemplateId:int}")]
+    [ProducesResponseType(typeof(BundleSaleTemplateDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<BundleSaleTemplateDto>> GetTemplate(int bundleSaleTemplateId, CancellationToken ct)
+    {
+        var result = await _bundles.GetTemplateAsync(bundleSaleTemplateId, ct);
+        return result is null ? NotFound() : Ok(result);
+    }
+
+    [HttpGet]
+    [ProducesResponseType(typeof(PagedResponse<BundleSaleSummaryDto>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<PagedResponse<BundleSaleSummaryDto>>> List(
+        [FromQuery] PageQuery query,
+        [FromQuery] BundleSaleStatus? status,
+        [FromQuery] int? customerId,
+        [FromQuery] int? warehouseId,
+        CancellationToken ct)
+        => Ok(await _bundles.ListAsync(query, status, customerId, warehouseId, ct));
+
+    [HttpGet("{bundleSaleId:int}")]
+    [ProducesResponseType(typeof(BundleSaleDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<BundleSaleDto>> GetById(int bundleSaleId, CancellationToken ct)
+    {
+        var result = await _bundles.GetAsync(bundleSaleId, ct);
+        return result is null ? NotFound() : Ok(result);
+    }
+
+    [HttpGet("{bundleSaleId:int}/posting-check")]
+    [ProducesResponseType(typeof(BundleSalePostingCheckDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<BundleSalePostingCheckDto>> PostingCheck(int bundleSaleId, CancellationToken ct)
+        => Ok(await _bundles.CheckPostingAsync(bundleSaleId, ct));
+
+    [HttpPost]
+    [ProducesResponseType(typeof(BundleSaleDto), StatusCodes.Status201Created)]
+    public async Task<ActionResult<BundleSaleDto>> Create([FromBody] CreateBundleSaleRequest request, CancellationToken ct)
+    {
+        var result = await _bundles.CreateAsync(request, ct);
+        return Created($"/api/v1/bundle-sales/{result.BundleSaleId}", result);
+    }
+
+    [HttpPut("{bundleSaleId:int}")]
+    [ProducesResponseType(typeof(BundleSaleDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<BundleSaleDto>> Update(int bundleSaleId, [FromBody] UpdateBundleSaleRequest request, CancellationToken ct)
+    {
+        return Ok(await _bundles.UpdateAsync(bundleSaleId, request, ct));
+    }
+
+    [HttpPost("{bundleSaleId:int}/post")]
+    [ProducesResponseType(typeof(BundleSaleDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<BundleSaleDto>> Post(int bundleSaleId, CancellationToken ct)
+        => Ok(await _bundles.PostAsync(bundleSaleId, ct));
+
+    [HttpPost("{bundleSaleId:int}/cancel")]
+    [ProducesResponseType(typeof(BundleSaleDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<BundleSaleDto>> Cancel(int bundleSaleId, CancellationToken ct)
+        => Ok(await _bundles.CancelAsync(bundleSaleId, ct));
+}

Backend/ERPCore/Controllers/CustomersController.cs

@@ -0,0 +1,69 @@
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Customers;
+using ERPCore.Services.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ERPCore.Controllers;
+
+/// <summary>Customer master endpoints for Phase 1 sales.</summary>
+[Route("api/v1/customers")]
+public sealed class CustomersController : ApiControllerBase
+{
+    private readonly ICustomerService _customers;
+
+    public CustomersController(ICustomerService customers) => _customers = customers;
+
+    [HttpGet]
+    [ProducesResponseType(typeof(PagedResponse<CustomerDto>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<PagedResponse<CustomerDto>>> List(
+        [FromQuery] PageQuery query,
+        [FromQuery] EntityStatus? status,
+        [FromQuery] CustomerType? customerType,
+        CancellationToken ct)
+        => Ok(await _customers.ListAsync(query, status, customerType, ct));
+
+    [HttpGet("{customerId:int}")]
+    [ProducesResponseType(typeof(CustomerDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<CustomerDto>> GetById(int customerId, CancellationToken ct)
+    {
+        var result = await _customers.GetAsync(customerId, ct);
+        if (result is null) return NotFound();
+
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpPost]
+    [ProducesResponseType(typeof(CustomerDto), StatusCodes.Status201Created)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    public async Task<ActionResult<CustomerDto>> Create([FromBody] CreateCustomerRequest request, CancellationToken ct)
+    {
+        var result = await _customers.CreateAsync(request, ct);
+        SetETag(result.RowVersion);
+        return Created($"/api/v1/customers/{result.Value.CustomerId}", result.Value);
+    }
+
+    [HttpPut("{customerId:int}")]
+    [ProducesResponseType(typeof(CustomerDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    [ProducesResponseType(StatusCodes.Status412PreconditionFailed)]
+    public async Task<ActionResult<CustomerDto>> Update(int customerId, [FromBody] UpdateCustomerRequest request, CancellationToken ct)
+    {
+        var expected = RequireIfMatch();
+        var result = await _customers.UpdateAsync(customerId, request, expected, ct);
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpPatch("{customerId:int}/status")]
+    [ProducesResponseType(StatusCodes.Status204NoContent)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<IActionResult> SetStatus(int customerId, [FromBody] UpdateCustomerStatusRequest request, CancellationToken ct)
+    {
+        await _customers.SetStatusAsync(customerId, request.Status, ct);
+        return NoContent();
+    }
+}

Backend/ERPCore/Controllers/FreeIssuesController.cs

@@ -0,0 +1,78 @@
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Sales;
+using ERPCore.Services.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ERPCore.Controllers;
+
+/// <summary>
+/// Thin API alias for free-issue handling. Free issues are modeled as sales slips
+/// with line-level <c>IsFreeIssue</c>/<c>FreeQty</c> flags, so this controller reuses
+/// the existing sales-slip CRUD surface under a more business-friendly route.
+/// </summary>
+[Route("api/v1/free-issues")]
+public sealed class FreeIssuesController : ApiControllerBase
+{
+    private readonly ISalesSlipService _slips;
+
+    public FreeIssuesController(ISalesSlipService slips) => _slips = slips;
+
+    [HttpGet]
+    [ProducesResponseType(typeof(PagedResponse<FreeIssueSummaryDto>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<PagedResponse<FreeIssueSummaryDto>>> List(
+        [FromQuery] PageQuery query,
+        [FromQuery] SalesSlipStatus? status,
+        [FromQuery] int? customerId,
+        [FromQuery] int? warehouseId,
+        CancellationToken ct)
+        => Ok(await _slips.ListFreeIssuesAsync(query, status, customerId, warehouseId, ct));
+
+    [HttpGet("{freeIssueId:int}")]
+    [ProducesResponseType(typeof(FreeIssueDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<FreeIssueDto>> GetById(int freeIssueId, CancellationToken ct)
+    {
+        var result = await _slips.GetFreeIssueAsync(freeIssueId, ct);
+        if (result is null) return NotFound();
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpGet("{freeIssueId:int}/posting-check")]
+    [ProducesResponseType(typeof(SalesSlipPostingCheckDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<SalesSlipPostingCheckDto>> PostingCheck(int freeIssueId, CancellationToken ct)
+        => Ok(await _slips.CheckPostingAsync(freeIssueId, ct));
+
+    [HttpPost]
+    [ProducesResponseType(typeof(FreeIssueDto), StatusCodes.Status201Created)]
+    public async Task<ActionResult<FreeIssueDto>> Create([FromBody] CreateSalesSlipRequest request, CancellationToken ct)
+    {
+        var result = await _slips.CreateAsync(request, ct);
+        SetETag(result.RowVersion);
+        return Created($"/api/v1/free-issues/{result.Value.SalesSlipId}", result.Value);
+    }
+
+    [HttpPut("{freeIssueId:int}")]
+    [ProducesResponseType(typeof(FreeIssueDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status412PreconditionFailed)]
+    public async Task<ActionResult<FreeIssueDto>> Update(int freeIssueId, [FromBody] UpdateSalesSlipRequest request, CancellationToken ct)
+    {
+        var expected = RequireIfMatch();
+        var result = await _slips.UpdateAsync(freeIssueId, request, expected, ct);
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpPost("{freeIssueId:int}/post")]
+    [ProducesResponseType(typeof(FreeIssueDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<FreeIssueDto>> Post(int freeIssueId, CancellationToken ct)
+        => Ok(await _slips.PostAsync(freeIssueId, ct));
+
+    [HttpPost("{freeIssueId:int}/cancel")]
+    [ProducesResponseType(typeof(FreeIssueDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<FreeIssueDto>> Cancel(int freeIssueId, CancellationToken ct)
+        => Ok(await _slips.CancelAsync(freeIssueId, ct));
+}

Backend/ERPCore/Controllers/GeneralLedgerController.cs

@@ -0,0 +1,43 @@
+using ERPCore.Services.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ERPCore.Controllers;
+
+/// <summary>
+/// Generic reverse proxy into the external General Ledger service — forwards every
+/// method/path/query/body under this prefix verbatim via
+/// <see cref="IGeneralLedgerService"/> and returns GL's response (status, content-type,
+/// body) unchanged. No endpoint-specific shape lives here; see
+/// docs/12-GENERAL-LEDGER-INTEGRATION.md for the full GL contract and what this proxy
+/// does and doesn't do. Gated by the same ERP door policy as every other v1 endpoint
+/// (<see cref="ApiControllerBase"/>) — the shared GL API key is attached server-side
+/// only and is never exposed to the frontend.
+/// </summary>
+[Route("api/v1/gl")]
+public sealed class GeneralLedgerController : ApiControllerBase
+{
+    private readonly IGeneralLedgerService _gl;
+
+    public GeneralLedgerController(IGeneralLedgerService gl) => _gl = gl;
+
+    [HttpGet("{**path}")]
+    public Task<IActionResult> Get(string path, CancellationToken ct) => ForwardAsync(HttpMethod.Get, path, ct);
+
+    [HttpPost("{**path}")]
+    public Task<IActionResult> Post(string path, CancellationToken ct) => ForwardAsync(HttpMethod.Post, path, ct);
+
+    [HttpPut("{**path}")]
+    public Task<IActionResult> Put(string path, CancellationToken ct) => ForwardAsync(HttpMethod.Put, path, ct);
+
+    private async Task<IActionResult> ForwardAsync(HttpMethod method, string path, CancellationToken ct)
+    {
+        var body = method == HttpMethod.Get ? null : Request.Body;
+        var result = await _gl.ForwardAsync(method, path, Request.QueryString.Value, Request.ContentType, body, ct);
+        return new ContentResult
+        {
+            StatusCode = result.StatusCode,
+            Content = result.Body,
+            ContentType = result.ContentType ?? "application/json"
+        };
+    }
+}

Backend/ERPCore/Controllers/ItemsController.cs

@@ -1,6 +1,7 @@
 using ERPCore.Domain.Enums;
 using ERPCore.Dtos.Common;
 using ERPCore.Dtos.Items;
+using ERPCore.Dtos.Uoms;
 using ERPCore.Services.Interfaces;
 using Microsoft.AspNetCore.Mvc;
 
@@ -11,8 +12,13 @@ namespace ERPCore.Controllers;
 public sealed class ItemsController : ApiControllerBase
 {
     private readonly IItemService _items;
+    private readonly IUomConverter _uomConverter;
 
-    public ItemsController(IItemService items) => _items = items;
+    public ItemsController(IItemService items, IUomConverter uomConverter)
+    {
+        _items = items;
+        _uomConverter = uomConverter;
+    }
 
     /// <summary>List items with optional filters and paging.</summary>
     [HttpGet]
@@ -88,4 +94,15 @@ public sealed class ItemsController : ApiControllerBase
     [ProducesResponseType(StatusCodes.Status404NotFound)]
     public async Task<ActionResult<ItemUomConversionsDto>> UpdateUomConversions(int itemId, [FromBody] UpdateUomConversionsRequest request, CancellationToken ct)
         => Ok(await _items.UpdateUomConversionsAsync(itemId, request, ct));
+
+    /// <summary>
+    /// The UOMs this item may be transacted in — its base UOM plus every UOM it has a
+    /// conversion from, each with the factor to base. Document line forms use this to offer
+    /// only units that will survive posting, instead of the whole global UOM list (FR-MD-02/03).
+    /// </summary>
+    [HttpGet("{itemId:int}/uoms")]
+    [ProducesResponseType(typeof(IReadOnlyList<AllowedUomDto>), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<IReadOnlyList<AllowedUomDto>>> GetAllowedUoms(int itemId, CancellationToken ct)
+        => Ok(await _uomConverter.GetAllowedUomsAsync(itemId, ct));
 }

Backend/ERPCore/Controllers/ProductionRunsController.cs

@@ -0,0 +1,157 @@
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Production;
+using ERPCore.Services.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ERPCore.Controllers;
+
+/// <summary>Production run endpoints (docs/30-BACKEND-PHASE2.md §D.2–D.3).</summary>
+[Route("api/v1/production-runs")]
+public sealed class ProductionRunsController : ApiControllerBase
+{
+    private readonly IProductionRunService _runs;
+
+    public ProductionRunsController(IProductionRunService runs) => _runs = runs;
+
+    [HttpGet]
+    [ProducesResponseType(typeof(PagedResponse<RunSummaryDto>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<PagedResponse<RunSummaryDto>>> List(
+        [FromQuery] PageQuery query,
+        [FromQuery] ProductionRunStatus? status,
+        [FromQuery] int? templateId,
+        [FromQuery] int? warehouseId,
+        CancellationToken ct)
+        => Ok(await _runs.ListAsync(query, status, templateId, warehouseId, ct));
+
+    [HttpGet("{runId:int}")]
+    [ProducesResponseType(typeof(RunGraphDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<RunGraphDto>> GetById(int runId, CancellationToken ct)
+    {
+        var result = await _runs.GetAsync(runId, ct);
+        if (result is null) return NotFound();
+
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpPost]
+    [ProducesResponseType(typeof(RunGraphDto), StatusCodes.Status201Created)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status422UnprocessableEntity)]
+    public async Task<ActionResult<RunGraphDto>> Create([FromBody] CreateRunRequest request, CancellationToken ct)
+    {
+        var result = await _runs.CreateAsync(request, ct);
+
+        SetETag(result.RowVersion);
+        return Created($"/api/v1/production-runs/{result.Value.RunId}", result.Value);
+    }
+
+    [HttpPut("{runId:int}/stages/{runStageId:int}/quantities")]
+    [ProducesResponseType(typeof(RunStageDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    [ProducesResponseType(StatusCodes.Status422UnprocessableEntity)]
+    public async Task<ActionResult<RunStageDto>> UpdateQuantities(
+        int runId, int runStageId, [FromBody] UpdateStageQuantitiesRequest request, CancellationToken ct)
+        => Ok(await _runs.UpdateStageQuantitiesAsync(runId, runStageId, request, ct));
+
+    // --- stage actions (docs/30 §D.3) ---------------------------------------
+    //
+    // Idempotency-Key is accepted on every action to match the Phase-1 contract (docs/11
+    // §1.6) but, as in GrnService.ConfirmAsync, it is not stored. Replay safety comes from
+    // the status guards instead: a double-fire finds the stage already moved on and gets a
+    // 409, which docs/21 §6 tells the client to treat as a silent refetch. Recorded as a
+    // deviation from §D.3's "idempotency-key honored".
+
+    [HttpPost("{runId:int}/stages/{runStageId:int}/start")]
+    [ProducesResponseType(typeof(StartStageResultDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    [ProducesResponseType(StatusCodes.Status422UnprocessableEntity)]
+    public async Task<ActionResult<StartStageResultDto>> Start(
+        int runId, int runStageId,
+        [FromHeader(Name = "Idempotency-Key")] string? idempotencyKey,
+        CancellationToken ct)
+        => Ok(await _runs.StartStageAsync(runId, runStageId, ct));
+
+    [HttpPost("{runId:int}/stages/{runStageId:int}/complete")]
+    [ProducesResponseType(typeof(RunStageDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    [ProducesResponseType(StatusCodes.Status422UnprocessableEntity)]
+    public async Task<ActionResult<RunStageDto>> Complete(
+        int runId, int runStageId, [FromBody] CompleteStageRequest request,
+        [FromHeader(Name = "Idempotency-Key")] string? idempotencyKey,
+        CancellationToken ct)
+        => Ok(await _runs.CompleteStageAsync(runId, runStageId, request, ct));
+
+    [HttpPost("{runId:int}/stages/{runStageId:int}/approve")]
+    [ProducesResponseType(typeof(ApproveStageResultDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    [ProducesResponseType(StatusCodes.Status422UnprocessableEntity)]
+    public async Task<ActionResult<ApproveStageResultDto>> Approve(
+        int runId, int runStageId, [FromBody] ApproveStageRequest? request,
+        [FromHeader(Name = "Idempotency-Key")] string? idempotencyKey,
+        CancellationToken ct)
+        => Ok(await _runs.ApproveStageAsync(runId, runStageId, request ?? new ApproveStageRequest(), ct));
+
+    [HttpPost("{runId:int}/stages/{runStageId:int}/transfer")]
+    [ProducesResponseType(typeof(TransferResultDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    [ProducesResponseType(StatusCodes.Status422UnprocessableEntity)]
+    public async Task<ActionResult<TransferResultDto>> Transfer(
+        int runId, int runStageId, [FromBody] TransferRemainderRequest request,
+        [FromHeader(Name = "Idempotency-Key")] string? idempotencyKey,
+        CancellationToken ct)
+        => Ok(await _runs.TransferAsync(runId, runStageId, request, ct));
+
+    [HttpPost("{runId:int}/inputs/{runInputId:int}/return-leftover")]
+    [ProducesResponseType(typeof(ReturnLeftoverResultDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    [ProducesResponseType(StatusCodes.Status422UnprocessableEntity)]
+    public async Task<ActionResult<ReturnLeftoverResultDto>> ReturnLeftover(
+        int runId, int runInputId, [FromBody] ReturnLeftoverRequest request,
+        [FromHeader(Name = "Idempotency-Key")] string? idempotencyKey,
+        CancellationToken ct)
+        => Ok(await _runs.ReturnLeftoverAsync(runId, runInputId, request, ct));
+
+    [HttpPost("{runId:int}/stages/{runStageId:int}/reject-intake")]
+    [ProducesResponseType(typeof(RejectIntakeResultDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    public async Task<ActionResult<RejectIntakeResultDto>> RejectIntake(
+        int runId, int runStageId, [FromBody] RejectRequest? request,
+        [FromHeader(Name = "Idempotency-Key")] string? idempotencyKey,
+        CancellationToken ct)
+        => Ok(await _runs.RejectIntakeAsync(runId, runStageId, request ?? new RejectRequest(), ct));
+
+    /// <summary>Terminal reject — resets the whole run for a rework pass (FR-MFG-16).</summary>
+    [HttpPost("{runId:int}/stages/{runStageId:int}/reject")]
+    [ProducesResponseType(typeof(TerminalRejectResultDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    public async Task<ActionResult<TerminalRejectResultDto>> Reject(
+        int runId, int runStageId, [FromBody] RejectRequest? request,
+        [FromHeader(Name = "Idempotency-Key")] string? idempotencyKey,
+        CancellationToken ct)
+        => Ok(await _runs.RejectTerminalAsync(runId, runStageId, request ?? new RejectRequest(), ct));
+
+    [HttpPost("{runId:int}/cancel")]
+    [ProducesResponseType(typeof(CancelRunResultDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    [ProducesResponseType(StatusCodes.Status422UnprocessableEntity)]
+    public async Task<ActionResult<CancelRunResultDto>> Cancel(
+        int runId, [FromBody] CancelRunRequest request,
+        [FromHeader(Name = "Idempotency-Key")] string? idempotencyKey,
+        CancellationToken ct)
+        => Ok(await _runs.CancelAsync(runId, request, ct));
+}

Backend/ERPCore/Controllers/ProductionTemplatesController.cs

@@ -0,0 +1,73 @@
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Production;
+using ERPCore.Services.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ERPCore.Controllers;
+
+/// <summary>Production template endpoints (docs/30-BACKEND-PHASE2.md §D.1).</summary>
+[Route("api/v1/production-templates")]
+public sealed class ProductionTemplatesController : ApiControllerBase
+{
+    private readonly IProductionTemplateService _templates;
+
+    public ProductionTemplatesController(IProductionTemplateService templates) => _templates = templates;
+
+    [HttpGet]
+    [ProducesResponseType(typeof(PagedResponse<TemplateSummaryDto>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<PagedResponse<TemplateSummaryDto>>> List(
+        [FromQuery] PageQuery query, [FromQuery] EntityStatus? status, CancellationToken ct)
+        => Ok(await _templates.ListAsync(query, status, ct));
+
+    [HttpGet("{templateId:int}")]
+    [ProducesResponseType(typeof(TemplateGraphDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<TemplateGraphDto>> GetById(int templateId, CancellationToken ct)
+    {
+        var result = await _templates.GetAsync(templateId, ct);
+        if (result is null) return NotFound();
+
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpPost]
+    [ProducesResponseType(typeof(TemplateGraphDto), StatusCodes.Status201Created)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    [ProducesResponseType(StatusCodes.Status422UnprocessableEntity)]
+    public async Task<ActionResult<TemplateGraphDto>> Create(
+        [FromBody] SaveTemplateRequest request, CancellationToken ct)
+    {
+        var result = await _templates.CreateAsync(request, ct);
+
+        SetETag(result.RowVersion);
+        return Created($"/api/v1/production-templates/{result.Value.TemplateId}", result.Value);
+    }
+
+    [HttpPut("{templateId:int}")]
+    [ProducesResponseType(typeof(TemplateGraphDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    [ProducesResponseType(StatusCodes.Status412PreconditionFailed)]
+    [ProducesResponseType(StatusCodes.Status422UnprocessableEntity)]
+    public async Task<ActionResult<TemplateGraphDto>> Update(
+        int templateId, [FromBody] SaveTemplateRequest request, CancellationToken ct)
+    {
+        var expected = RequireIfMatch();
+        var result = await _templates.UpdateAsync(templateId, request, expected, ct);
+
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpPatch("{templateId:int}/status")]
+    [ProducesResponseType(StatusCodes.Status204NoContent)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<IActionResult> SetStatus(
+        int templateId, [FromBody] UpdateTemplateStatusRequest request, CancellationToken ct)
+    {
+        await _templates.SetStatusAsync(templateId, request.Status, ct);
+        return NoContent();
+    }
+}

Backend/ERPCore/Controllers/SalesInvoicesController.cs

@@ -0,0 +1,73 @@
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Sales;
+using ERPCore.Services.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ERPCore.Controllers;
+
+[Route("api/v1/sales-invoices")]
+public sealed class SalesInvoicesController : ApiControllerBase
+{
+    private readonly ISalesInvoiceService _invoices;
+
+    public SalesInvoicesController(ISalesInvoiceService invoices) => _invoices = invoices;
+
+    [HttpGet]
+    [ProducesResponseType(typeof(PagedResponse<SalesInvoiceSummaryDto>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<PagedResponse<SalesInvoiceSummaryDto>>> List(
+        [FromQuery] PageQuery query,
+        [FromQuery] SalesInvoiceStatus? status,
+        [FromQuery] int? customerId,
+        [FromQuery] int? warehouseId,
+        CancellationToken ct)
+        => Ok(await _invoices.ListAsync(query, status, customerId, warehouseId, ct));
+
+    [HttpGet("{salesInvoiceId:int}")]
+    [ProducesResponseType(typeof(SalesInvoiceDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<SalesInvoiceDto>> GetById(int salesInvoiceId, CancellationToken ct)
+    {
+        var result = await _invoices.GetAsync(salesInvoiceId, ct);
+        if (result is null) return NotFound();
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpGet("{salesInvoiceId:int}/posting-check")]
+    [ProducesResponseType(typeof(SalesInvoicePostingCheckDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<SalesInvoicePostingCheckDto>> PostingCheck(int salesInvoiceId, CancellationToken ct)
+        => Ok(await _invoices.CheckPostingAsync(salesInvoiceId, ct));
+
+    [HttpPost]
+    [ProducesResponseType(typeof(SalesInvoiceDto), StatusCodes.Status201Created)]
+    public async Task<ActionResult<SalesInvoiceDto>> Create([FromBody] CreateSalesInvoiceRequest request, CancellationToken ct)
+    {
+        var result = await _invoices.CreateAsync(request, ct);
+        SetETag(result.RowVersion);
+        return Created($"/api/v1/sales-invoices/{result.Value.SalesInvoiceId}", result.Value);
+    }
+
+    [HttpPut("{salesInvoiceId:int}")]
+    [ProducesResponseType(typeof(SalesInvoiceDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status412PreconditionFailed)]
+    public async Task<ActionResult<SalesInvoiceDto>> Update(int salesInvoiceId, [FromBody] UpdateSalesInvoiceRequest request, CancellationToken ct)
+    {
+        var expected = RequireIfMatch();
+        var result = await _invoices.UpdateAsync(salesInvoiceId, request, expected, ct);
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpPost("{salesInvoiceId:int}/post")]
+    [ProducesResponseType(typeof(SalesInvoiceDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<SalesInvoiceDto>> Post(int salesInvoiceId, CancellationToken ct)
+        => Ok(await _invoices.PostAsync(salesInvoiceId, ct));
+
+    [HttpPost("{salesInvoiceId:int}/cancel")]
+    [ProducesResponseType(typeof(SalesInvoiceDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<SalesInvoiceDto>> Cancel(int salesInvoiceId, CancellationToken ct)
+        => Ok(await _invoices.CancelAsync(salesInvoiceId, ct));
+}

Backend/ERPCore/Controllers/SalesReportsController.cs

@@ -0,0 +1,35 @@
+using ERPCore.Dtos.Sales;
+using ERPCore.Services.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ERPCore.Controllers;
+
+[Route("api/v1/reports/sales")]
+public sealed class SalesReportsController : ApiControllerBase
+{
+    private readonly ISalesReportService _reports;
+
+    public SalesReportsController(ISalesReportService reports) => _reports = reports;
+
+    [HttpGet]
+    [ProducesResponseType(typeof(IReadOnlyList<SalesReportDefinitionDto>), StatusCodes.Status200OK)]
+    public ActionResult<IReadOnlyList<SalesReportDefinitionDto>> ListReports()
+        => Ok(_reports.ListReports());
+
+    [HttpGet("{reportId}")]
+    [ProducesResponseType(typeof(SalesReportDefinitionDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public ActionResult<SalesReportDefinitionDto> GetReport(string reportId)
+    {
+        var report = _reports.GetReport(reportId);
+        return report is null ? NotFound() : Ok(report);
+    }
+
+    [HttpPost("query")]
+    [ProducesResponseType(typeof(SalesReportQueryResponse), StatusCodes.Status200OK)]
+    public async Task<ActionResult<SalesReportQueryResponse>> Query([FromBody] SalesReportQueryRequest request, CancellationToken ct)
+    {
+        var rows = await _reports.QueryAsync(request.ReportType, request.From, request.To, request.ItemId, request.CustomerId, request.WarehouseId, ct);
+        return Ok(new SalesReportQueryResponse(request.ReportType, request.From, request.To, rows));
+    }
+}

Backend/ERPCore/Controllers/SalesSlipPromotionsController.cs

@@ -0,0 +1,22 @@
+using ERPCore.Dtos.Sales;
+using ERPCore.Services.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ERPCore.Controllers;
+
+[Route("api/v1/sales-slips/{salesSlipId:int}/free-issue-suggestions")]
+public sealed class SalesSlipPromotionsController : ApiControllerBase
+{
+    private readonly ISalesPromotionSuggestionService _suggestions;
+
+    public SalesSlipPromotionsController(ISalesPromotionSuggestionService suggestions) => _suggestions = suggestions;
+
+    [HttpGet]
+    [ProducesResponseType(typeof(SalesFreeIssueSuggestionDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<SalesFreeIssueSuggestionDto>> Get(int salesSlipId, CancellationToken ct)
+    {
+        var result = await _suggestions.GetFreeIssueSuggestionsAsync(salesSlipId, ct);
+        return result is null ? NotFound() : Ok(result);
+    }
+}

Backend/ERPCore/Controllers/SalesSlipsController.cs

@@ -0,0 +1,73 @@
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Sales;
+using ERPCore.Services.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ERPCore.Controllers;
+
+[Route("api/v1/sales-slips")]
+public sealed class SalesSlipsController : ApiControllerBase
+{
+    private readonly ISalesSlipService _slips;
+
+    public SalesSlipsController(ISalesSlipService slips) => _slips = slips;
+
+    [HttpGet]
+    [ProducesResponseType(typeof(PagedResponse<SalesSlipSummaryDto>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<PagedResponse<SalesSlipSummaryDto>>> List(
+        [FromQuery] PageQuery query,
+        [FromQuery] SalesSlipStatus? status,
+        [FromQuery] int? customerId,
+        [FromQuery] int? warehouseId,
+        CancellationToken ct)
+        => Ok(await _slips.ListAsync(query, status, customerId, warehouseId, ct));
+
+    [HttpGet("{salesSlipId:int}")]
+    [ProducesResponseType(typeof(SalesSlipDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<SalesSlipDto>> GetById(int salesSlipId, CancellationToken ct)
+    {
+        var result = await _slips.GetAsync(salesSlipId, ct);
+        if (result is null) return NotFound();
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpGet("{salesSlipId:int}/posting-check")]
+    [ProducesResponseType(typeof(SalesSlipPostingCheckDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<SalesSlipPostingCheckDto>> PostingCheck(int salesSlipId, CancellationToken ct)
+        => Ok(await _slips.CheckPostingAsync(salesSlipId, ct));
+
+    [HttpPost]
+    [ProducesResponseType(typeof(SalesSlipDto), StatusCodes.Status201Created)]
+    public async Task<ActionResult<SalesSlipDto>> Create([FromBody] CreateSalesSlipRequest request, CancellationToken ct)
+    {
+        var result = await _slips.CreateAsync(request, ct);
+        SetETag(result.RowVersion);
+        return Created($"/api/v1/sales-slips/{result.Value.SalesSlipId}", result.Value);
+    }
+
+    [HttpPut("{salesSlipId:int}")]
+    [ProducesResponseType(typeof(SalesSlipDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status412PreconditionFailed)]
+    public async Task<ActionResult<SalesSlipDto>> Update(int salesSlipId, [FromBody] UpdateSalesSlipRequest request, CancellationToken ct)
+    {
+        var expected = RequireIfMatch();
+        var result = await _slips.UpdateAsync(salesSlipId, request, expected, ct);
+        SetETag(result.RowVersion);
+        return Ok(result.Value);
+    }
+
+    [HttpPost("{salesSlipId:int}/post")]
+    [ProducesResponseType(typeof(SalesSlipDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<SalesSlipDto>> Post(int salesSlipId, CancellationToken ct)
+        => Ok(await _slips.PostAsync(salesSlipId, ct));
+
+    [HttpPost("{salesSlipId:int}/cancel")]
+    [ProducesResponseType(typeof(SalesSlipDto), StatusCodes.Status200OK)]
+    public async Task<ActionResult<SalesSlipDto>> Cancel(int salesSlipId, CancellationToken ct)
+        => Ok(await _slips.CancelAsync(salesSlipId, ct));
+}

Backend/ERPCore/Domain/DocumentTypes.cs

@@ -14,4 +14,10 @@ public static class DocumentTypes
     public const string Adjustment = "ADJ";
     public const string Count = "CNT";
     public const string PurchaseReturn = "PRET";
+
+    /// <summary>Production run (docs/30 FR-MFG-08) — <c>PRD-2026-00001</c>.</summary>
+    public const string Production = "PRD";
+    public const string SalesInvoice = "SI";
+    public const string SalesSlip = "SSL";
+    public const string BundleSale = "BND";
 }

Backend/ERPCore/Domain/Entities/BundleSale.cs

@@ -0,0 +1,33 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+public class BundleSale
+{
+    public int BundleSaleId { get; set; }
+    public string BundleNo { get; set; } = string.Empty;
+    public DateTime BundleDate { get; set; }
+    public int CustomerId { get; set; }
+    public Customer? Customer { get; set; }
+    public string CustomerSnapshotName { get; set; } = string.Empty;
+    public int WarehouseId { get; set; }
+    public Warehouse? Warehouse { get; set; }
+    public int CashierUserId { get; set; }
+    public User? CashierUser { get; set; }
+    public int BundleSaleTemplateId { get; set; }
+    public BundleSaleTemplate? BundleSaleTemplate { get; set; }
+    public string BundleName { get; set; } = string.Empty;
+    public string BundleCode { get; set; } = string.Empty;
+    public BundleSaleStatus Status { get; set; } = BundleSaleStatus.Draft;
+    public decimal ComponentSubtotal { get; set; }
+    public decimal BundlePrice { get; set; }
+    public decimal MarginAmount { get; set; }
+    public decimal DiscountTotal { get; set; }
+    public decimal TaxTotal { get; set; }
+    public decimal GrandTotal { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime? UpdatedAt { get; set; }
+    public int ConcurrencyStamp { get; set; }
+
+    public ICollection<BundleSaleLine> Lines { get; set; } = new List<BundleSaleLine>();
+}

Backend/ERPCore/Domain/Entities/BundleSaleLine.cs

@@ -0,0 +1,35 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+public class BundleSaleLine
+{
+    public int BundleSaleLineId { get; set; }
+    public int BundleSaleId { get; set; }
+    public BundleSale? BundleSale { get; set; }
+
+    public int ItemId { get; set; }
+    public Item? Item { get; set; }
+    public string Description { get; set; } = string.Empty;
+    /// <summary>Component quantity, in <see cref="UomId"/> — what the user entered.</summary>
+    public decimal Qty { get; set; }
+    public int UomId { get; set; }
+    public Uom? Uom { get; set; }
+
+    /// <summary>
+    /// <see cref="Qty"/> restated in the item's base UOM, resolved once at save. Posting
+    /// consumes this. <see cref="Qty"/> and <see cref="UnitPrice"/> are always a matching
+    /// pair in <see cref="UomId"/>, so <see cref="LineTotal"/> stays value-correct.
+    /// </summary>
+    public decimal QtyBase { get; set; }
+
+    /// <summary>The factor used to derive <see cref="QtyBase"/>; 1 when the line is in base UOM.</summary>
+    public decimal ConversionFactor { get; set; } = 1m;
+    public int WarehouseId { get; set; }
+    public Warehouse? Warehouse { get; set; }
+    public decimal UnitPrice { get; set; }
+    public decimal LineTotal { get; set; }
+    public bool IncludeInBundle { get; set; } = true;
+    public bool IsComponent { get; set; } = true;
+    public int? ParentLineId { get; set; }
+}

Backend/ERPCore/Domain/Entities/BundleSaleTemplate.cs

@@ -0,0 +1,17 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+public class BundleSaleTemplate
+{
+    public int BundleSaleTemplateId { get; set; }
+    public string TemplateCode { get; set; } = string.Empty;
+    public string TemplateName { get; set; } = string.Empty;
+    public string? Description { get; set; }
+    public EntityStatus Status { get; set; } = EntityStatus.Active;
+    public DateTime CreatedAt { get; set; }
+    public DateTime? UpdatedAt { get; set; }
+    public int ConcurrencyStamp { get; set; }
+
+    public ICollection<BundleSaleTemplateLine> Lines { get; set; } = new List<BundleSaleTemplateLine>();
+}

Backend/ERPCore/Domain/Entities/BundleSaleTemplateLine.cs

@@ -0,0 +1,20 @@
+namespace ERPCore.Domain.Entities;
+
+public class BundleSaleTemplateLine
+{
+    public int BundleSaleTemplateLineId { get; set; }
+    public int BundleSaleTemplateId { get; set; }
+    public BundleSaleTemplate? BundleSaleTemplate { get; set; }
+
+    public int ItemId { get; set; }
+    public Item? Item { get; set; }
+    public int UomId { get; set; }
+    public Uom? Uom { get; set; }
+    public int WarehouseId { get; set; }
+    public Warehouse? Warehouse { get; set; }
+
+    public decimal Qty { get; set; }
+    public decimal UnitPrice { get; set; }
+    public bool IncludeInBundle { get; set; } = true;
+    public int SortOrder { get; set; }
+}

Backend/ERPCore/Domain/Entities/Customer.cs

@@ -0,0 +1,38 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+/// <summary>
+/// Customer master for both B2B and B2C sales.
+/// Phase 1 keeps this lean: identity, contact, tax, credit, and default warehouse.
+/// </summary>
+public class Customer
+{
+    public int CustomerId { get; set; }
+    public string CustomerCode { get; set; } = string.Empty;
+    public CustomerType CustomerType { get; set; } = CustomerType.B2C;
+
+    public string Name { get; set; } = string.Empty;
+    public string? DisplayName { get; set; }
+    public string? Phone { get; set; }
+    public string? Email { get; set; }
+
+    public string? AddressLine1 { get; set; }
+    public string? AddressLine2 { get; set; }
+    public string? City { get; set; }
+    public string? Country { get; set; }
+
+    public string? TaxRegistrationNo { get; set; }
+    public decimal CreditLimit { get; set; }
+    public int CreditDays { get; set; }
+
+    public int? DefaultWarehouseId { get; set; }
+    public Warehouse? DefaultWarehouse { get; set; }
+
+    public EntityStatus Status { get; set; } = EntityStatus.Active;
+    public DateTime CreatedAt { get; set; }
+    public DateTime? UpdatedAt { get; set; }
+
+    /// <summary>PostgreSQL xmin-backed optimistic concurrency token (ETag source).</summary>
+    public uint RowVersion { get; set; }
+}

Backend/ERPCore/Domain/Entities/GrnLine.cs

@@ -34,8 +34,20 @@ public class GrnLine
     public int? BatchId { get; set; }
     public Batch? Batch { get; set; }
 
+    /// <summary>Quantity received, in <see cref="UomId"/> — what the user entered.</summary>
     public decimal Qty { get; set; }
 
+    /// <summary>
+    /// <see cref="Qty"/> restated in the item's base UOM, resolved once at line creation.
+    /// Confirm reads this snapshot rather than re-converting, so a conversion factor edited
+    /// between create and confirm cannot change what a saved GRN posts, and a later reversal
+    /// reproduces the original layer exactly.
+    /// </summary>
+    public decimal QtyBase { get; set; }
+
+    /// <summary>The factor used to derive <see cref="QtyBase"/>; 1 when the line is in base UOM.</summary>
+    public decimal ConversionFactor { get; set; } = 1m;
+
     /// <summary>Gross unit cost received at (entered, or PO price when omitted).</summary>
     public decimal UnitCost { get; set; }
 

Backend/ERPCore/Domain/Entities/PoLine.cs

@@ -21,8 +21,32 @@ public class PoLine
     public int WarehouseId { get; set; }
     public Warehouse? Warehouse { get; set; }
 
+    /// <summary>Quantity ordered, in <see cref="UomId"/>.</summary>
     public decimal Qty { get; set; }
     public decimal UnitPrice { get; set; }//
     public decimal Tax { get; set; }
+
+    /// <summary>
+    /// <see cref="Qty"/> restated in the item's base UOM, resolved once at line creation.
+    /// This — not <see cref="Qty"/> — is what open-quantity and close checks compare against,
+    /// because a GRN may legitimately receive against this line in a different UOM.
+    /// </summary>
+    public decimal QtyBase { get; set; }
+
+    /// <summary>The factor used to derive <see cref="QtyBase"/>; 1 when the line is in base UOM.</summary>
+    public decimal ConversionFactor { get; set; } = 1m;
+
+    /// <summary>
+    /// Accrues as GRNs confirm (FR-PROC-07), in <see cref="UomId"/>. <b>Denormalized for
+    /// display only</b> — it is derived by dividing <see cref="QtyReceivedBase"/> by the
+    /// factor, so it can drift. Never branch on it; use <see cref="QtyReceivedBase"/>.
+    /// </summary>
     public decimal QtyReceived { get; set; }
+
+    /// <summary>
+    /// Authoritative received-to-date in the item's base UOM. GRN confirm accrues here and
+    /// the PO close condition compares this against <see cref="QtyBase"/>, so receipts in a
+    /// UOM other than the PO's still add up correctly.
+    /// </summary>
+    public decimal QtyReceivedBase { get; set; }
 }

Backend/ERPCore/Domain/Entities/ProductionRun.cs

@@ -0,0 +1,59 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+/// <summary>
+/// One execution instance of a template (FR-MFG-08), numbered <c>PRD-2026-00001</c>.
+/// Every stage, input, output and edge is <b>copied</b> from the template at creation
+/// with quantities scaled by <see cref="ScaleFactor"/>, so a completed run stays
+/// readable even if the template is later edited (FR-MFG-06).
+/// <para>The run's <b>cost pool</b> is derived, never stored:
+/// <c>Σ RunStageInput.ConsumedValue − Σ RunStageInput.ReturnedValue</c>. The terminal
+/// approve divides it by the good quantity to cost the finished layer, then closes it
+/// (FR-MFG-13, <c>409 RUN_COST_CLOSED</c>).</para>
+/// Mutable aggregate with a <see cref="RowVersion"/> token. Model: docs/30 Part C.
+/// </summary>
+public class ProductionRun
+{
+    public int RunId { get; set; }
+    public string DocNo { get; set; } = string.Empty;
+
+    public int TemplateId { get; set; }
+    public ProductionTemplate? Template { get; set; }
+
+    /// <summary>Stock inputs are consumed from, and the finished good received into, this warehouse.</summary>
+    public int WarehouseId { get; set; }
+    public Warehouse? Warehouse { get; set; }
+
+    /// <summary>Optional destination bin for the finished goods. Reaches the ledger only — stock layers carry no bin.</summary>
+    public int? OutputBinId { get; set; }
+    public Bin? OutputBin { get; set; }
+
+    /// <summary>Target quantity of the finished item; drives <see cref="ScaleFactor"/>.</summary>
+    public decimal TargetQty { get; set; }
+
+    /// <summary><c>TargetQty / terminalOutput.QtyPerBatch</c>, applied to every copied quantity.</summary>
+    public decimal ScaleFactor { get; set; }
+
+    public ProductionRunStatus Status { get; set; } = ProductionRunStatus.InProgress;
+
+    /// <summary>Incremented by each terminal reject (FR-MFG-16); prior figures live in the event history.</summary>
+    public int ReworkCount { get; set; }
+
+    public int? CancelReasonCodeId { get; set; }
+    public ReasonCode? CancelReason { get; set; }
+
+    public int CreatedBy { get; set; }
+    public User? Creator { get; set; }
+
+    public DateTime CreatedAt { get; set; }
+
+    /// <summary>Set by the terminal approve only. A cancelled run leaves this null.</summary>
+    public DateTime? CompletedAt { get; set; }
+
+    public uint RowVersion { get; set; }
+
+    public ICollection<RunStage> Stages { get; set; } = new List<RunStage>();
+    public ICollection<RunEdge> Edges { get; set; } = new List<RunEdge>();
+    public ICollection<RunStageEvent> Events { get; set; } = new List<RunStageEvent>();
+}

Backend/ERPCore/Domain/Entities/ProductionTemplate.cs

@@ -0,0 +1,43 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+/// <summary>
+/// A reusable production-line definition — the stage graph designed on the canvas
+/// (FR-MFG-01). Never hard-deleted once referenced by a run; deactivated instead
+/// (FR-MD-08 posture). Editing is locked while any run of it is InProgress
+/// (FR-MFG-06, <c>409 TEMPLATE_IN_USE</c>) — edit-lock replaces versioning, which is
+/// why runs copy display fields at creation. Mutable aggregate with a
+/// <see cref="RowVersion"/> token. Model: docs/30 Part C.
+/// </summary>
+public class ProductionTemplate
+{
+    public int TemplateId { get; set; }
+    public string Code { get; set; } = string.Empty;
+    public string Name { get; set; } = string.Empty;
+    public string? Description { get; set; }
+
+    public EntityStatus Status { get; set; } = EntityStatus.Active;
+
+    /// <summary>
+    /// Canvas-only annotations (grouping boxes and divider lines) as a jsonb array, stored
+    /// verbatim and never interpreted server-side.
+    /// </summary>
+    /// <remarks>
+    /// Not in docs/30 Part C — added because the builder canvas already draws these and
+    /// without somewhere to keep them a save would silently discard the user's layout notes.
+    /// They carry no graph semantics: no ports, no edges, and the validator never sees them.
+    /// Nullable so a template that has none stores nothing rather than an empty array.
+    /// </remarks>
+    public string? Annotations { get; set; }
+
+    public int CreatedBy { get; set; }
+    public User? Creator { get; set; }
+
+    public DateTime CreatedAt { get; set; }
+    public uint RowVersion { get; set; }
+
+    public ICollection<TemplateStage> Stages { get; set; } = new List<TemplateStage>();
+    public ICollection<StageEdge> Edges { get; set; } = new List<StageEdge>();
+    public ICollection<ProductionRun> Runs { get; set; } = new List<ProductionRun>();
+}

Backend/ERPCore/Domain/Entities/RunEdge.cs

@@ -0,0 +1,28 @@
+namespace ERPCore.Domain.Entities;
+
+/// <summary>
+/// A parent → child arrow copied from the template's <see cref="StageEdge"/> set at run
+/// creation.
+/// <para><b>Addition to docs/30 Part C (recorded).</b> The doc's entity model has no run
+/// edge table, but the run graph needs its own copy: deriving edges at read time through
+/// <c>RunStage.TemplateStageId → STAGE_EDGE</c> would let a later template edit silently
+/// rewrite completed-run history — the exact thing FR-MFG-06 exists to prevent — and
+/// breaks outright once that link is nulled by a stage deletion.</para>
+/// <para>Used for the run canvas, child-readiness evaluation and reject-intake's
+/// "delivering parents". Note that <b>WIP delivery is routed by
+/// <c>RunStageInput.FromRunOutputId</c>, not by these edges</b> — an edge is display and
+/// validation only.</para>
+/// </summary>
+public class RunEdge
+{
+    public int RunEdgeId { get; set; }
+
+    public int RunId { get; set; }
+    public ProductionRun? Run { get; set; }
+
+    public int ParentRunStageId { get; set; }
+    public RunStage? ParentRunStage { get; set; }
+
+    public int ChildRunStageId { get; set; }
+    public RunStage? ChildRunStage { get; set; }
+}

Backend/ERPCore/Domain/Entities/RunStage.cs

@@ -0,0 +1,59 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+/// <summary>
+/// One stage of a run — a copy of a <see cref="TemplateStage"/> taken at run creation
+/// (FR-MFG-06), carrying its own live status and actual timings. Model: docs/30 Part C.
+/// <para><b>Whether this stage is terminal is derived</b>, never stored: a stage is
+/// terminal when it has no outbound <see cref="RunEdge"/>. Storing it would let it
+/// drift from the edge set.</para>
+/// </summary>
+public class RunStage
+{
+    public int RunStageId { get; set; }
+
+    public int RunId { get; set; }
+    public ProductionRun? Run { get; set; }
+
+    /// <summary>
+    /// Provenance link back to the template stage. <b>Nullable</b>: a template PUT may
+    /// delete a stage while completed/cancelled runs still reference it (the edit-lock
+    /// only blocks edits during InProgress runs), so the FK is <c>SET NULL</c> rather
+    /// than blocking the edit forever. Everything needed to display a historical run is
+    /// copied below, which is exactly what FR-MFG-06 anticipates.
+    /// </summary>
+    public int? TemplateStageId { get; set; }
+    public TemplateStage? TemplateStage { get; set; }
+
+    // --- copied from the template at run creation (FR-MFG-06) ---
+    public string Name { get; set; } = string.Empty;
+    public string? RoleLabel { get; set; }
+    public int EstimatedMinutes { get; set; }
+    public decimal PosX { get; set; }
+    public decimal PosY { get; set; }
+
+    public ProductionStageStatus Status { get; set; } = ProductionStageStatus.Waiting;
+
+    /// <summary>Stamped at start; preserved across a reject-intake rework so the original start stands (FR-MFG-19).</summary>
+    public DateTime? ActualStartAt { get; set; }
+    public DateTime? ActualEndAt { get; set; }
+
+    /// <summary>Copied from the template stage; definitions survive a rework.</summary>
+    public string FieldDefs { get; set; } = "[]";
+
+    /// <summary>Captured at complete as a jsonb object; cleared by a terminal reject so required fields are re-answered.</summary>
+    public string? FieldValues { get; set; }
+
+    /// <summary>
+    /// Concurrency token. Stage actions re-read the stage inside their transaction and
+    /// let this xmin check serialize concurrent requests — it is what stops two
+    /// simultaneous terminal approves from both reading <c>Done</c> and posting two
+    /// receipts. See the idempotency note in <c>ProductionRunService</c>.
+    /// </summary>
+    public uint RowVersion { get; set; }
+
+    public ICollection<RunStageInput> Inputs { get; set; } = new List<RunStageInput>();
+    public ICollection<RunStageOutput> Outputs { get; set; } = new List<RunStageOutput>();
+    public ICollection<RunStageEvent> Events { get; set; } = new List<RunStageEvent>();
+}

Backend/ERPCore/Domain/Entities/RunStageEvent.cs

@@ -0,0 +1,40 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+/// <summary>
+/// Immutable history of everything that happened to a run (docs/30 Part C). Written by
+/// every mutating action and never updated or deleted, so a run's story — including the
+/// figures discarded by each rework — survives in full.
+/// <para><b>Addition to docs/30 Part C (recorded):</b> <see cref="RunId"/>. The doc hangs
+/// events off the stage only, which leaves run-level events (cancel, terminal reject)
+/// with no home and forces the detail timeline to join through stages. Keeping both
+/// links makes <see cref="RunStageId"/> optional and the timeline a single query.</para>
+/// </summary>
+public class RunStageEvent
+{
+    public int EventId { get; set; }
+
+    public int RunId { get; set; }
+    public ProductionRun? Run { get; set; }
+
+    /// <summary>Null for run-level events (Cancel).</summary>
+    public int? RunStageId { get; set; }
+    public RunStage? RunStage { get; set; }
+
+    public RunStageEventType EventType { get; set; }
+
+    public string? Note { get; set; }
+
+    /// <summary>
+    /// Event-specific detail as jsonb — consumed layers on a Start, pulled-back
+    /// quantities on a RejectIntake, the full pre-rework snapshot on a TerminalReject.
+    /// Pre-serialized string, written only through <c>ProductionJson</c>.
+    /// </summary>
+    public string? Payload { get; set; }
+
+    public int UserId { get; set; }
+    public User? User { get; set; }
+
+    public DateTime CreatedAt { get; set; }
+}

Backend/ERPCore/Domain/Entities/RunStageInput.cs

@@ -0,0 +1,55 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+/// <summary>
+/// One input line of a run stage — a copy of a <see cref="StageInput"/> with its
+/// quantity scaled at creation, plus the live consumption/delivery figures.
+/// Model: docs/30 Part C.
+/// <para><b>Stock inputs</b> accumulate <see cref="ConsumedQty"/>/<see cref="ConsumedValue"/>
+/// at each start and <see cref="ReturnedQty"/>/<see cref="ReturnedValue"/> on leftover
+/// return or run cancel. Those four columns are the whole cost pool
+/// (<c>Σ consumed − Σ returned</c>) and are deliberately <b>not</b> reset by a terminal
+/// reject — already-consumed material stays in the pool (FR-MFG-16).</para>
+/// <para><b>Upstream inputs</b> accumulate <see cref="DeliveredQty"/> as parent stages
+/// transfer WIP in. The stage becomes Ready only when every upstream input has
+/// <c>DeliveredQty &gt;= PlannedQty</c> (FR-MFG-09, an all-parents join).</para>
+/// </summary>
+public class RunStageInput
+{
+    public int RunInputId { get; set; }
+
+    public int RunStageId { get; set; }
+    public RunStage? RunStage { get; set; }
+
+    public StageInputSource Source { get; set; }
+
+    public int? ItemId { get; set; }
+    public Item? Item { get; set; }
+
+    /// <summary>The parent output feeding this input. This — not <see cref="RunEdge"/> — is what routes a transfer.</summary>
+    public int? FromRunOutputId { get; set; }
+    public RunStageOutput? FromRunOutput { get; set; }
+
+    public int UomId { get; set; }
+    public Uom? Uom { get; set; }
+
+    /// <summary>Scaled at creation; per-run editable until the stage starts (FR-MFG-08, <c>409 STAGE_NOT_EDITABLE</c>).</summary>
+    public decimal PlannedQty { get; set; }
+
+    /// <summary>
+    /// Stock inputs only, in the item's <b>base</b> UOM. A start consumes
+    /// <c>max(0, PlannedQty − ConsumedQty)</c> and adds to these, so a rework restart
+    /// with an unchanged planned quantity consumes nothing and one with a raised planned
+    /// quantity consumes only the delta (FR-MFG-16).
+    /// </summary>
+    public decimal ConsumedQty { get; set; }
+    public decimal ConsumedValue { get; set; }
+
+    /// <summary>Upstream inputs only: accumulated by parent transfers.</summary>
+    public decimal DeliveredQty { get; set; }
+
+    /// <summary>Leftover returns (FR-MFG-14) and cancel returns (FR-MFG-17), at the consumed weighted cost.</summary>
+    public decimal ReturnedQty { get; set; }
+    public decimal ReturnedValue { get; set; }
+}

Backend/ERPCore/Domain/Entities/RunStageOutput.cs

@@ -0,0 +1,43 @@
+namespace ERPCore.Domain.Entities;
+
+/// <summary>
+/// One output line of a run stage — a copy of a <see cref="StageOutput"/> with its
+/// quantity scaled at creation, plus the live produced/scrapped/transferred figures.
+/// Model: docs/30 Part C.
+/// <para><b>Available to transfer is derived, never stored:</b>
+/// <c>ProducedQty − ScrappedQty − TransferredQty</c>. Every transfer path checks it and
+/// raises <c>422 TRANSFER_EXCEEDS_AVAILABLE</c> (FR-MFG-12).</para>
+/// <para>Scrap cost is <b>absorbed</b> into the run cost pool as normal yield loss — no
+/// write-off ledger entry is posted (FR-MFG-11).</para>
+/// </summary>
+public class RunStageOutput
+{
+    public int RunOutputId { get; set; }
+
+    public int RunStageId { get; set; }
+    public RunStage? RunStage { get; set; }
+
+    /// <summary>Null on intermediate (WIP) outputs; set on the terminal output — the finished good.</summary>
+    public int? ItemId { get; set; }
+    public Item? Item { get; set; }
+
+    public string Name { get; set; } = string.Empty;
+
+    public int UomId { get; set; }
+    public Uom? Uom { get; set; }
+
+    /// <summary>Scaled at creation; per-run editable until the stage starts.</summary>
+    public decimal PlannedQty { get; set; }
+
+    /// <summary>Recorded at complete. A re-complete after a rework <b>overwrites</b> this, never adds to it.</summary>
+    public decimal ProducedQty { get; set; }
+
+    public decimal ScrappedQty { get; set; }
+
+    /// <summary>Mandatory when <see cref="ScrappedQty"/> &gt; 0, context <c>Production</c> (FR-MFG-11).</summary>
+    public int? ScrapReasonCodeId { get; set; }
+    public ReasonCode? ScrapReason { get; set; }
+
+    /// <summary>Total WIP handed to children so far, across approve and any later partial transfers.</summary>
+    public decimal TransferredQty { get; set; }
+}

Backend/ERPCore/Domain/Entities/SalesInvoice.cs

@@ -0,0 +1,41 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+public class SalesInvoice
+{
+    public int SalesInvoiceId { get; set; }
+    public string InvoiceNo { get; set; } = string.Empty;
+    public DateTime InvoiceDate { get; set; }
+
+    public int CustomerId { get; set; }
+    public Customer? Customer { get; set; }
+
+    public string CustomerSnapshotName { get; set; } = string.Empty;
+    public string? CustomerSnapshotTaxNo { get; set; }
+
+    public int WarehouseId { get; set; }
+    public Warehouse? Warehouse { get; set; }
+
+    public SalesInvoiceType InvoiceType { get; set; } = SalesInvoiceType.B2C;
+    public SalesInvoiceStatus Status { get; set; } = SalesInvoiceStatus.Draft;
+
+    public decimal Subtotal { get; set; }
+    public decimal DiscountTotal { get; set; }
+    public decimal TaxTotal { get; set; }
+    public decimal GrandTotal { get; set; }
+    public decimal RoundOff { get; set; }
+    public decimal NetPayable { get; set; }
+    public decimal PaidAmount { get; set; }
+    public decimal BalanceAmount { get; set; }
+
+    public int CreatedBy { get; set; }
+    public User? Creator { get; set; }
+
+    public DateTime CreatedAt { get; set; }
+    public DateTime? UpdatedAt { get; set; }
+
+    public uint RowVersion { get; set; }
+
+    public ICollection<SalesInvoiceLine> Lines { get; set; } = new List<SalesInvoiceLine>();
+}

Backend/ERPCore/Domain/Entities/SalesInvoiceLine.cs

@@ -0,0 +1,52 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+public class SalesInvoiceLine
+{
+    public int SalesInvoiceLineId { get; set; }
+
+    public int SalesInvoiceId { get; set; }
+    public SalesInvoice? SalesInvoice { get; set; }
+
+    public int ItemId { get; set; }
+    public Item? Item { get; set; }
+
+    public string Description { get; set; } = string.Empty;
+
+    /// <summary>Quantity sold, in <see cref="UomId"/> — what the user entered and what prints.</summary>
+    public decimal Qty { get; set; }
+    public decimal FreeQty { get; set; }
+    public int UomId { get; set; }
+    public Uom? Uom { get; set; }
+
+    /// <summary>
+    /// <see cref="Qty"/> restated in the item's base UOM, resolved once at save. Posting
+    /// consumes stock against this snapshot — the FIFO engine is base-UOM only, so passing
+    /// the entered quantity would deplete the wrong amount whenever the line is not in base UOM.
+    /// </summary>
+    public decimal QtyBase { get; set; }
+
+    /// <summary><see cref="FreeQty"/> restated in the item's base UOM.</summary>
+    public decimal FreeQtyBase { get; set; }
+
+    /// <summary>The factor used to derive the base quantities; 1 when the line is in base UOM.</summary>
+    public decimal ConversionFactor { get; set; } = 1m;
+    public int WarehouseId { get; set; }
+    public Warehouse? Warehouse { get; set; }
+
+    public decimal UnitPrice { get; set; }
+    public decimal BaseCost { get; set; }
+    public string PriceSource { get; set; } = string.Empty;
+    public SalesDiscountMode DiscountMode { get; set; } = SalesDiscountMode.Percentage;
+    public decimal DiscountPct { get; set; }
+    public decimal DiscountAmount { get; set; }
+    public decimal NetUnitPrice { get; set; }
+    public decimal LineTotal { get; set; }
+    public decimal TaxPct { get; set; }
+    public decimal TaxAmount { get; set; }
+    public bool IsFreeIssue { get; set; }
+    public int? ParentLineId { get; set; }
+
+    public uint RowVersion { get; set; }
+}

Backend/ERPCore/Domain/Entities/SalesSlip.cs

@@ -0,0 +1,36 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+public class SalesSlip
+{
+    public int SalesSlipId { get; set; }
+    public string SlipNo { get; set; } = string.Empty;
+    public DateTime SlipDate { get; set; }
+
+    public int CustomerId { get; set; }
+    public Customer? Customer { get; set; }
+
+    public string CustomerSnapshotName { get; set; } = string.Empty;
+    public int WarehouseId { get; set; }
+    public Warehouse? Warehouse { get; set; }
+
+    public int CashierUserId { get; set; }
+    public User? CashierUser { get; set; }
+
+    public SalesSlipStatus Status { get; set; } = SalesSlipStatus.Draft;
+
+    public decimal Subtotal { get; set; }
+    public decimal DiscountTotal { get; set; }
+    public decimal TaxTotal { get; set; }
+    public decimal GrandTotal { get; set; }
+    public decimal PaidAmount { get; set; }
+    public decimal BalanceAmount { get; set; }
+
+    public DateTime CreatedAt { get; set; }
+    public DateTime? UpdatedAt { get; set; }
+
+    public uint RowVersion { get; set; }
+
+    public ICollection<SalesSlipLine> Lines { get; set; } = new List<SalesSlipLine>();
+}

Backend/ERPCore/Domain/Entities/SalesSlipLine.cs

@@ -0,0 +1,52 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+public class SalesSlipLine
+{
+    public int SalesSlipLineId { get; set; }
+
+    public int SalesSlipId { get; set; }
+    public SalesSlip? SalesSlip { get; set; }
+
+    public int ItemId { get; set; }
+    public Item? Item { get; set; }
+
+    public string Description { get; set; } = string.Empty;
+
+    /// <summary>Quantity sold, in <see cref="UomId"/> — what the user entered and what prints.</summary>
+    public decimal Qty { get; set; }
+    public decimal FreeQty { get; set; }
+    public int UomId { get; set; }
+    public Uom? Uom { get; set; }
+
+    /// <summary>
+    /// <see cref="Qty"/> restated in the item's base UOM, resolved once at save. Posting
+    /// consumes stock against this snapshot — the FIFO engine is base-UOM only, so passing
+    /// the entered quantity would deplete the wrong amount whenever the line is not in base UOM.
+    /// </summary>
+    public decimal QtyBase { get; set; }
+
+    /// <summary><see cref="FreeQty"/> restated in the item's base UOM.</summary>
+    public decimal FreeQtyBase { get; set; }
+
+    /// <summary>The factor used to derive the base quantities; 1 when the line is in base UOM.</summary>
+    public decimal ConversionFactor { get; set; } = 1m;
+    public int WarehouseId { get; set; }
+    public Warehouse? Warehouse { get; set; }
+
+    public decimal UnitPrice { get; set; }
+    public decimal BaseCost { get; set; }
+    public string PriceSource { get; set; } = string.Empty;
+    public SalesDiscountMode DiscountMode { get; set; } = SalesDiscountMode.Percentage;
+    public decimal DiscountPct { get; set; }
+    public decimal DiscountAmount { get; set; }
+    public decimal NetUnitPrice { get; set; }
+    public decimal LineTotal { get; set; }
+    public decimal TaxPct { get; set; }
+    public decimal TaxAmount { get; set; }
+    public bool IsFreeIssue { get; set; }
+    public int? ParentLineId { get; set; }
+
+    public uint RowVersion { get; set; }
+}

Backend/ERPCore/Domain/Entities/StageEdge.cs

@@ -0,0 +1,21 @@
+namespace ERPCore.Domain.Entities;
+
+/// <summary>
+/// A parent → child arrow on the template canvas. The edge set must form a DAG with
+/// at least one entry stage and exactly one terminal stage; that is enforced in
+/// <c>ProductionGraphValidator</c> on every save, not by the database (FR-MFG-02).
+/// Model: docs/30 Part C.
+/// </summary>
+public class StageEdge
+{
+    public int EdgeId { get; set; }
+
+    public int TemplateId { get; set; }
+    public ProductionTemplate? Template { get; set; }
+
+    public int ParentStageId { get; set; }
+    public TemplateStage? ParentStage { get; set; }
+
+    public int ChildStageId { get; set; }
+    public TemplateStage? ChildStage { get; set; }
+}

Backend/ERPCore/Domain/Entities/StageInput.cs

@@ -0,0 +1,39 @@
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Domain.Entities;
+
+/// <summary>
+/// One line of a stage's input formula (FR-MFG-04). Exactly one of the two source
+/// shapes applies, enforced by <c>ProductionGraphValidator</c>:
+/// <list type="bullet">
+/// <item><see cref="StageInputSource.Stock"/> — <see cref="ItemId"/> set,
+/// <see cref="FromOutputId"/> null. FIFO-consumed from the run warehouse at stage
+/// start. Allowed on <i>any</i> stage, e.g. packaging added late.</item>
+/// <item><see cref="StageInputSource.Upstream"/> — <see cref="FromOutputId"/> set to
+/// an output of a <b>direct parent</b> stage, <see cref="ItemId"/> null. Flows as
+/// internal WIP and never touches stock or the ledger.</item>
+/// </list>
+/// Model: docs/30 Part C.
+/// </summary>
+public class StageInput
+{
+    public int InputId { get; set; }
+
+    public int StageId { get; set; }
+    public TemplateStage? Stage { get; set; }
+
+    public StageInputSource Source { get; set; }
+
+    /// <summary>Required when <see cref="Source"/> is Stock; null when Upstream.</summary>
+    public int? ItemId { get; set; }
+    public Item? Item { get; set; }
+
+    /// <summary>Required when <see cref="Source"/> is Upstream; must belong to a direct parent.</summary>
+    public int? FromOutputId { get; set; }
+    public StageOutput? FromOutput { get; set; }
+
+    public int UomId { get; set; }
+    public Uom? Uom { get; set; }
+
+    public decimal QtyPerBatch { get; set; }
+}

Backend/ERPCore/Domain/Entities/StageOutput.cs

@@ -0,0 +1,27 @@
+namespace ERPCore.Domain.Entities;
+
+/// <summary>
+/// A named quantity produced by a stage (FR-MFG-05). Intermediate outputs are
+/// <b>internal WIP only</b> — <see cref="ItemId"/> is null, no stock and no ledger row
+/// is ever written for them. The terminal stage is the exception: it has exactly one
+/// output and that output <b>must</b> reference a real Item (the finished good), which
+/// is what the production receipt creates a layer for. Model: docs/30 Part C.
+/// </summary>
+public class StageOutput
+{
+    public int OutputId { get; set; }
+
+    public int StageId { get; set; }
+    public TemplateStage? Stage { get; set; }
+
+    /// <summary>Null on intermediate stages; required on the terminal stage.</summary>
+    public int? ItemId { get; set; }
+    public Item? Item { get; set; }
+
+    public string Name { get; set; } = string.Empty;
+
+    public int UomId { get; set; }
+    public Uom? Uom { get; set; }
+
+    public decimal QtyPerBatch { get; set; }
+}

Backend/ERPCore/Domain/Entities/TemplateStage.cs

@@ -0,0 +1,36 @@
+namespace ERPCore.Domain.Entities;
+
+/// <summary>
+/// One box on the template canvas (FR-MFG-03): a named step with a role label, an
+/// estimated duration, a formula (<see cref="Inputs"/> + <see cref="Outputs"/>) and
+/// custom field definitions. Model: docs/30 Part C.
+/// </summary>
+public class TemplateStage
+{
+    public int StageId { get; set; }
+
+    public int TemplateId { get; set; }
+    public ProductionTemplate? Template { get; set; }
+
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>Free text (e.g. "QA"). Informational only this phase — never enforced (FR-X-01).</summary>
+    public string? RoleLabel { get; set; }
+
+    public int EstimatedMinutes { get; set; }
+
+    /// <summary>Canvas coordinates — stored verbatim, never interpreted server-side (FR-MFG-03).</summary>
+    public decimal PosX { get; set; }
+    public decimal PosY { get; set; }
+
+    /// <summary>
+    /// Custom field definitions as jsonb: <c>[{ key, label, type, options?, required }]</c>
+    /// (FR-MFG-07). Held as a pre-serialized string, matching the <c>AuditLog.ChangeSet</c>
+    /// precedent; always written through <c>ProductionJson</c> so the column can only ever
+    /// hold canonical JSON.
+    /// </summary>
+    public string FieldDefs { get; set; } = "[]";
+
+    public ICollection<StageInput> Inputs { get; set; } = new List<StageInput>();
+    public ICollection<StageOutput> Outputs { get; set; } = new List<StageOutput>();
+}

Backend/ERPCore/Domain/Enums/BundleSaleStatus.cs

@@ -0,0 +1,8 @@
+namespace ERPCore.Domain.Enums;
+
+public enum BundleSaleStatus
+{
+    Draft = 0,
+    Posted = 1,
+    Cancelled = 2
+}

Backend/ERPCore/Domain/Enums/CustomFieldType.cs

@@ -0,0 +1,16 @@
+namespace ERPCore.Domain.Enums;
+
+/// <summary>
+/// Input type of a stage custom field (FR-MFG-07; docs/30 §D.5 <c>fieldType</c>).
+/// Lives inside the <c>field_defs</c> jsonb rather than a column, but is modelled as an
+/// enum so a bad value is rejected at the DTO boundary instead of reaching the database.
+/// <see cref="Select"/> is the only type that reads <c>options</c>.
+/// </summary>
+public enum CustomFieldType
+{
+    Text,
+    Number,
+    Checkbox,
+    Date,
+    Select
+}

Backend/ERPCore/Domain/Enums/CustomerType.cs

@@ -0,0 +1,8 @@
+namespace ERPCore.Domain.Enums;
+
+public enum CustomerType
+{
+    B2B = 1,
+    B2C = 2,
+    WalkIn = 3
+}

Backend/ERPCore/Domain/Enums/ProductionRunStatus.cs

@@ -0,0 +1,14 @@
+namespace ERPCore.Domain.Enums;
+
+/// <summary>
+/// Lifecycle of a production run (docs/30 §B.4, §D.5). A run is created
+/// <see cref="InProgress"/> and reaches exactly one final state: it completes at the
+/// terminal stage's approve (production receipt, FR-MFG-13) or is cancelled with a
+/// stock return (FR-MFG-17). Stored as a string.
+/// </summary>
+public enum ProductionRunStatus
+{
+    InProgress,
+    Completed,
+    Cancelled
+}

Backend/ERPCore/Domain/Enums/ProductionStageStatus.cs

@@ -0,0 +1,22 @@
+namespace ERPCore.Domain.Enums;
+
+/// <summary>
+/// Status of one stage within a production run (docs/30 §B.4, §D.5).
+/// <code>
+/// Waiting ──(all upstream inputs fully delivered)──▶ Ready
+/// Ready ──start (FIFO-consume Stock inputs)──▶ InProgress
+/// InProgress ──complete (produced/scrap/fields)──▶ Done
+/// Done ──approve──▶ Approved   (non-terminal: WIP transfers out; terminal: receipt)
+/// </code>
+/// Rejection is not a resting state (FR-MFG-15/16): a reject immediately produces a
+/// rework transition back into this set and is recorded as a
+/// <see cref="RunStageEventType"/> instead. Stored as a string.
+/// </summary>
+public enum ProductionStageStatus
+{
+    Waiting,
+    Ready,
+    InProgress,
+    Done,
+    Approved
+}

Backend/ERPCore/Domain/Enums/ReasonContext.cs

@@ -5,5 +5,8 @@ public enum ReasonContext
 {
     Adjustment,
     Return,
-    Count
+    Count,
+
+    /// <summary>Manufacturing: scrap, leftover return, run cancel (docs/30 §A.2).</summary>
+    Production
 }

Backend/ERPCore/Domain/Enums/RunStageEventType.cs

@@ -0,0 +1,20 @@
+namespace ERPCore.Domain.Enums;
+
+/// <summary>
+/// Kind of entry in a run's immutable history (docs/30 Part C, <c>RUN_STAGE_EVENT</c>).
+/// Every mutating action on a run writes exactly one event carrying who/when plus a
+/// jsonb payload; <see cref="TerminalReject"/> additionally snapshots the whole run's
+/// figures for the rework pass being discarded (FR-MFG-16). Stored as a string.
+/// </summary>
+public enum RunStageEventType
+{
+    Start,
+    Complete,
+    Approve,
+    Transfer,
+    RejectIntake,
+    TerminalReject,
+    LeftoverReturn,
+    Cancel,
+    QuantityEdit
+}

Backend/ERPCore/Domain/Enums/SalesDiscountMode.cs

@@ -0,0 +1,7 @@
+namespace ERPCore.Domain.Enums;
+
+public enum SalesDiscountMode
+{
+    Percentage = 1,
+    Amount = 2
+}

Backend/ERPCore/Domain/Enums/SalesInvoiceStatus.cs

@@ -0,0 +1,8 @@
+namespace ERPCore.Domain.Enums;
+
+public enum SalesInvoiceStatus
+{
+    Draft = 1,
+    Posted = 2,
+    Cancelled = 3
+}

Backend/ERPCore/Domain/Enums/SalesInvoiceType.cs

@@ -0,0 +1,9 @@
+namespace ERPCore.Domain.Enums;
+
+public enum SalesInvoiceType
+{
+    B2B = 1,
+    B2C = 2,
+    Cash = 3,
+    Credit = 4
+}

Backend/ERPCore/Domain/Enums/SalesSlipStatus.cs

@@ -0,0 +1,8 @@
+namespace ERPCore.Domain.Enums;
+
+public enum SalesSlipStatus
+{
+    Draft = 1,
+    Posted = 2,
+    Cancelled = 3
+}

Backend/ERPCore/Domain/Enums/StageInputSource.cs

@@ -0,0 +1,14 @@
+namespace ERPCore.Domain.Enums;
+
+/// <summary>
+/// Where a stage input's material comes from (FR-MFG-04; docs/30 §D.5).
+/// <see cref="Stock"/> inputs reference an Item and are FIFO-consumed from the run
+/// warehouse when the stage starts. <see cref="Upstream"/> inputs reference a direct
+/// parent stage's output and flow as internal WIP — they never touch the ledger.
+/// Stored as a string.
+/// </summary>
+public enum StageInputSource
+{
+    Stock,
+    Upstream
+}

Backend/ERPCore/Domain/LedgerSourceTypes.cs

@@ -0,0 +1,34 @@
+namespace ERPCore.Domain;
+
+/// <summary>
+/// Additional <c>STOCK_LEDGER.source_doc_type</c> values for manufacturing movements
+/// (docs/30 §A.2). <c>source_doc_id</c> is always the <c>run_id</c>, so
+/// <c>LIKE 'PRD%'</c> traces every stock movement a run caused.
+/// </summary>
+/// <remarks>
+/// <para><b>Deviation from docs/30 §A.2 (recorded).</b> The doc proposes the long names
+/// <c>ProductionIssue</c>/<c>ProductionReceipt</c>/<c>ProductionReturn</c>/
+/// <c>ProductionCancelReturn</c>, but both <c>stock_ledger.SourceDocType</c> and
+/// <c>journal_entry_stubs.SourceDocType</c> are <c>varchar(10)</c> and every existing
+/// value is a short prefix (<c>GRN</c>, <c>TRF</c>, <c>ADJ</c>, <c>PRET</c>). Widening
+/// those columns would be a second Phase-1 schema change beyond the single deviation
+/// §A.1 declares (NFR-08), so the short codes below extend the existing convention
+/// instead. docs/30 §A.2 and §D.5 are amended to match.</para>
+/// <para>These are <b>not</b> <see cref="DocumentTypes"/> entries — production issues no
+/// document per movement. The run's own document number uses
+/// <see cref="DocumentTypes.Production"/> (<c>PRD-2026-00001</c>).</para>
+/// </remarks>
+public static class LedgerSourceTypes
+{
+    /// <summary>Stock consumed by a stage start (FR-MFG-10). Outbound.</summary>
+    public const string ProductionIssue = "PRDI";
+
+    /// <summary>Finished goods received at the terminal approve (FR-MFG-13). Inbound.</summary>
+    public const string ProductionReceipt = "PRDR";
+
+    /// <summary>Unconsumed material returned before receipt (FR-MFG-14). Inbound.</summary>
+    public const string ProductionReturn = "PRDL";
+
+    /// <summary>Net consumed stock returned when a run is cancelled (FR-MFG-17). Inbound.</summary>
+    public const string ProductionCancelReturn = "PRDC";
+}

Backend/ERPCore/Dtos/Customers/CustomerDtos.cs

@@ -0,0 +1,66 @@
+using System.ComponentModel.DataAnnotations;
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Dtos.Customers;
+
+/// <summary>Customer resource used by sales documents.</summary>
+public sealed record CustomerDto(
+    int CustomerId,
+    string CustomerCode,
+    CustomerType CustomerType,
+    string Name,
+    string? DisplayName,
+    string? Phone,
+    string? Email,
+    string? AddressLine1,
+    string? AddressLine2,
+    string? City,
+    string? Country,
+    string? TaxRegistrationNo,
+    decimal CreditLimit,
+    int CreditDays,
+    int? DefaultWarehouseId,
+    EntityStatus Status,
+    DateTime CreatedAt,
+    DateTime? UpdatedAt);
+
+public sealed class CreateCustomerRequest
+{
+    [Required, StringLength(50)] public string CustomerCode { get; set; } = string.Empty;
+    [Required, EnumDataType(typeof(CustomerType))] public CustomerType CustomerType { get; set; } = CustomerType.B2C;
+    [Required, StringLength(200)] public string Name { get; set; } = string.Empty;
+    [StringLength(200)] public string? DisplayName { get; set; }
+    [StringLength(30)] public string? Phone { get; set; }
+    [StringLength(100)] public string? Email { get; set; }
+    [StringLength(250)] public string? AddressLine1 { get; set; }
+    [StringLength(250)] public string? AddressLine2 { get; set; }
+    [StringLength(100)] public string? City { get; set; }
+    [StringLength(100)] public string? Country { get; set; }
+    [StringLength(50)] public string? TaxRegistrationNo { get; set; }
+    [Range(0, double.MaxValue)] public decimal CreditLimit { get; set; }
+    [Range(0, int.MaxValue)] public int CreditDays { get; set; }
+    public int? DefaultWarehouseId { get; set; }
+}
+
+public sealed class UpdateCustomerRequest
+{
+    [Required, StringLength(50)] public string CustomerCode { get; set; } = string.Empty;
+    [Required, EnumDataType(typeof(CustomerType))] public CustomerType CustomerType { get; set; } = CustomerType.B2C;
+    [Required, StringLength(200)] public string Name { get; set; } = string.Empty;
+    [StringLength(200)] public string? DisplayName { get; set; }
+    [StringLength(30)] public string? Phone { get; set; }
+    [StringLength(100)] public string? Email { get; set; }
+    [StringLength(250)] public string? AddressLine1 { get; set; }
+    [StringLength(250)] public string? AddressLine2 { get; set; }
+    [StringLength(100)] public string? City { get; set; }
+    [StringLength(100)] public string? Country { get; set; }
+    [StringLength(50)] public string? TaxRegistrationNo { get; set; }
+    [Range(0, double.MaxValue)] public decimal CreditLimit { get; set; }
+    [Range(0, int.MaxValue)] public int CreditDays { get; set; }
+    public int? DefaultWarehouseId { get; set; }
+}
+
+public sealed class UpdateCustomerStatusRequest
+{
+    [Required, EnumDataType(typeof(EntityStatus))] public EntityStatus Status { get; set; }
+}

Backend/ERPCore/Dtos/Procurement/PurchaseOrderDtos.cs

@@ -5,9 +5,18 @@ namespace ERPCore.Dtos.Procurement;
 
 // Responses (docs/11 §3.3) ------------------------------------------------------
 
+/// <summary>
+/// A PO line. <paramref name="Qty"/> and <paramref name="QtyReceived"/> are in
+/// <paramref name="UomId"/> and are what the user sees; <paramref name="QtyBase"/> and
+/// <paramref name="QtyReceivedBase"/> are the item's base UOM and are what the server
+/// actually enforces — GRN over-receipt and the PO close condition both run on the base
+/// pair, because goods may legitimately be received in a different UOM from the one
+/// ordered. A client showing remaining/outstanding quantity should read the base pair.
+/// </summary>
 public sealed record PoLineDto(
     int PoLineId, int ItemId, int UomId, int WarehouseId,
-    decimal Qty, decimal UnitPrice, decimal Tax, decimal QtyReceived);
+    decimal Qty, decimal UnitPrice, decimal Tax, decimal QtyReceived,
+    decimal QtyBase = 0m, decimal QtyReceivedBase = 0m, decimal ConversionFactor = 1m);
 
 public sealed record PoTotalsDto(decimal SubTotal, decimal Tax, decimal GrandTotal, string Currency);
 

Backend/ERPCore/Dtos/Production/RunDtos.cs

@@ -0,0 +1,113 @@
+using System.ComponentModel.DataAnnotations;
+using System.Text.Json;
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Dtos.Production;
+
+// Production run contract (docs/30-BACKEND-PHASE2.md §D.2–D.3).
+//
+// Statuses are never client-settable (02-SECURITY §B.6): a run's status and every stage
+// status move only through the stage-action endpoints. Requests here carry quantities and
+// references, nothing else.
+
+// --- responses ---------------------------------------------------------------
+
+/// <summary>Per-status stage counts driving the board's progress strip (FR-MFG-18, docs/21 §3).</summary>
+public sealed record StageSummaryDto(int Waiting, int Ready, int InProgress, int Done, int Approved);
+
+/// <summary>Row on the run board (docs/30 §D.2 <c>GET /production-runs</c>).</summary>
+public sealed record RunSummaryDto(
+    int RunId, string DocNo, int TemplateId, string TemplateName,
+    decimal TargetQty, ProductionRunStatus Status, int ReworkCount,
+    StageSummaryDto StageSummary, int WarehouseId,
+    int? FinishedItemId, string? FinishedItemName,
+    int CreatedBy, DateTime CreatedAt, DateTime? CompletedAt);
+
+/// <summary>
+/// The run cost pool (FR-MFG-13). Always derived from the stage inputs, never stored —
+/// surfaced so the UI can preview the finished unit cost before approving the terminal.
+/// </summary>
+public sealed record CostPoolDto(decimal Consumed, decimal Returned, decimal Net);
+
+public sealed record RunStageInputDto(
+    int RunInputId, StageInputSource Source, int? ItemId, int? FromRunOutputId, int UomId,
+    decimal PlannedQty, decimal ConsumedQty, decimal ConsumedValue,
+    decimal DeliveredQty, decimal ReturnedQty, decimal ReturnedValue);
+
+/// <summary>
+/// One output of a run stage. <c>AvailableToTransfer</c> is derived — produced − scrapped −
+/// transferred (FR-MFG-12) — and never stored.
+/// </summary>
+public sealed record RunStageOutputDto(
+    int RunOutputId, int? ItemId, string Name, int UomId,
+    decimal PlannedQty, decimal ProducedQty, decimal ScrappedQty, int? ScrapReasonCodeId,
+    decimal TransferredQty, decimal AvailableToTransfer);
+
+/// <summary>
+/// One stage of a run. <c>IsTerminal</c> (no outbound edge) and <c>IsEntry</c> (no inbound
+/// edge) are derived from the run edge set rather than stored, so they cannot drift from it.
+/// <c>ActualMinutes</c> is the elapsed whole minutes once the stage has finished, null while
+/// it is still running (FR-MFG-19). <c>FieldValues</c> is the raw jsonb captured at complete,
+/// passed through verbatim.
+/// </summary>
+public sealed record RunStageDto(
+    int RunStageId, int? TemplateStageId, string Name, string? RoleLabel,
+    int EstimatedMinutes, decimal PosX, decimal PosY,
+    ProductionStageStatus Status, bool IsTerminal, bool IsEntry,
+    DateTime? ActualStartAt, DateTime? ActualEndAt, int? ActualMinutes,
+    IReadOnlyList<FieldDefDto> FieldDefs, JsonElement? FieldValues,
+    IReadOnlyList<RunStageInputDto> Inputs, IReadOnlyList<RunStageOutputDto> Outputs);
+
+public sealed record RunEdgeDto(int RunEdgeId, int ParentRunStageId, int ChildRunStageId);
+
+public sealed record RunEventDto(
+    int EventId, int? RunStageId, RunStageEventType EventType, string? Note,
+    JsonElement? Payload, int UserId, DateTime CreatedAt);
+
+/// <summary>Full run graph (docs/30 §D.2 <c>GET /production-runs/{id}</c>).</summary>
+public sealed record RunGraphDto(
+    int RunId, string DocNo, int TemplateId, string TemplateName,
+    int WarehouseId, int? OutputBinId,
+    decimal TargetQty, decimal ScaleFactor,
+    ProductionRunStatus Status, int ReworkCount, int? CancelReasonCodeId,
+    CostPoolDto CostPool,
+    IReadOnlyList<RunStageDto> Stages, IReadOnlyList<RunEdgeDto> Edges, IReadOnlyList<RunEventDto> Events,
+    int CreatedBy, DateTime CreatedAt, DateTime? CompletedAt);
+
+// --- requests ----------------------------------------------------------------
+
+public sealed class CreateRunRequest
+{
+    [Range(1, int.MaxValue)]
+    public int TemplateId { get; set; }
+
+    /// <summary>Quantity of the finished item; drives the whole graph's scale factor (FR-MFG-08).</summary>
+    [Range(0.0001, double.MaxValue)]
+    public decimal TargetQty { get; set; }
+
+    [Range(1, int.MaxValue)]
+    public int WarehouseId { get; set; }
+
+    /// <summary>Optional bin for the finished goods; must belong to <see cref="WarehouseId"/>.</summary>
+    public int? OutputBinId { get; set; }
+}
+
+/// <summary>
+/// Per-run scaling override (FR-MFG-08). Only accepted while the stage has not started
+/// (<c>409 STAGE_NOT_EDITABLE</c>).
+/// </summary>
+public sealed class UpdateStageQuantitiesRequest
+{
+    public List<StageQuantityLine> Inputs { get; set; } = new();
+    public List<StageQuantityLine> Outputs { get; set; } = new();
+}
+
+public sealed class StageQuantityLine
+{
+    /// <summary>The <c>runInputId</c> or <c>runOutputId</c> being adjusted.</summary>
+    [Range(1, int.MaxValue)]
+    public int Id { get; set; }
+
+    [Range(0.0001, double.MaxValue)]
+    public decimal PlannedQty { get; set; }
+}

Backend/ERPCore/Dtos/Production/StageActionDtos.cs

@@ -0,0 +1,177 @@
+using System.ComponentModel.DataAnnotations;
+using System.Text.Json;
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Dtos.Production;
+
+// Stage-action contract (docs/30-BACKEND-PHASE2.md §D.3). Every action is transactional,
+// guards on the stage's current status, and returns the refreshed stage plus whatever
+// stock effects it caused.
+
+// --- start -------------------------------------------------------------------
+
+/// <summary>One FIFO layer a stage start drew from, at that layer's cost.</summary>
+public sealed record ConsumedLayerDto(int LayerId, decimal Qty, decimal UnitCost);
+
+/// <summary>What a single Stock input consumed at start (FR-MFG-10).</summary>
+public sealed record ConsumedInputDto(
+    int RunInputId, int ItemId, decimal Qty, decimal Value, IReadOnlyList<ConsumedLayerDto> ConsumedLayers);
+
+public sealed record StartStageResultDto(
+    int RunStageId, ProductionStageStatus Status, DateTime? ActualStartAt,
+    IReadOnlyList<ConsumedInputDto> Consumed, IReadOnlyList<int> LedgerRefs,
+    RunStageDto Stage);
+
+// --- complete ----------------------------------------------------------------
+
+public sealed class CompleteStageRequest
+{
+    [Required, MinLength(1)]
+    public List<CompleteOutputLine> Outputs { get; set; } = new();
+
+    /// <summary>
+    /// Values for the stage's custom fields, keyed by <c>fieldDefs[].key</c>. Every field
+    /// marked required must be present and non-empty (<c>400 REQUIRED_FIELD_MISSING</c>).
+    /// </summary>
+    public JsonElement? FieldValues { get; set; }
+}
+
+public sealed class CompleteOutputLine
+{
+    [Range(1, int.MaxValue)]
+    public int RunOutputId { get; set; }
+
+    [Range(0, double.MaxValue)]
+    public decimal ProducedQty { get; set; }
+
+    [Range(0, double.MaxValue)]
+    public decimal ScrappedQty { get; set; }
+
+    /// <summary>Mandatory once <see cref="ScrappedQty"/> &gt; 0; must be a Production reason.</summary>
+    public int? ScrapReasonCodeId { get; set; }
+}
+
+// --- approve / transfer ------------------------------------------------------
+
+/// <summary>
+/// One WIP hand-off from a parent output to a child input. Deliveries route by
+/// <c>fromRunOutputId</c>, not by edge — see the note on <c>RunEdge</c>.
+/// </summary>
+public sealed record TransferDto(
+    int RunOutputId, int RunInputId, int ChildRunStageId, decimal Qty,
+    decimal ChildDeliveredQty, ProductionStageStatus ChildStatus);
+
+/// <summary>The finished-goods layer a terminal approve created (FR-MFG-13).</summary>
+public sealed record ReceiptDto(
+    int LayerId, int ItemId, int WarehouseId, int? BinId,
+    decimal QtyReceived, decimal UnitCost, decimal Value);
+
+public sealed record ApproveStageResultDto(
+    int RunStageId, ProductionStageStatus Status, ProductionRunStatus RunStatus,
+    IReadOnlyList<TransferDto> Transfers,
+    ReceiptDto? Receipt, CostPoolDto? CostPool, IReadOnlyList<int> LedgerRefs,
+    RunStageDto Stage);
+
+public sealed class ApproveStageRequest
+{
+    /// <summary>
+    /// Optional partial transfers. Omitted or empty means transfer the full available
+    /// quantity of every output (FR-MFG-12).
+    /// </summary>
+    public List<TransferLine> Transfers { get; set; } = new();
+}
+
+public sealed class TransferLine
+{
+    [Range(1, int.MaxValue)]
+    public int RunOutputId { get; set; }
+
+    [Range(0.0001, double.MaxValue)]
+    public decimal Qty { get; set; }
+
+    /// <summary>
+    /// Optional explicit target. When an output feeds several child inputs the server
+    /// otherwise fills them in <c>runInputId</c> order; naming one removes the ambiguity.
+    /// </summary>
+    public int? RunInputId { get; set; }
+}
+
+public sealed class TransferRemainderRequest
+{
+    [Range(1, int.MaxValue)]
+    public int RunOutputId { get; set; }
+
+    [Range(0.0001, double.MaxValue)]
+    public decimal Qty { get; set; }
+
+    public int? RunInputId { get; set; }
+}
+
+public sealed record TransferResultDto(
+    int RunStageId, IReadOnlyList<TransferDto> Transfers, RunStageDto Stage);
+
+// --- leftover return ---------------------------------------------------------
+
+public sealed class ReturnLeftoverRequest
+{
+    /// <summary>
+    /// Quantity to return, in the item's <b>base</b> UOM — the same unit
+    /// <c>consumedQty</c>/<c>returnedQty</c> are stored in, since the return posts straight
+    /// to stock. Cannot exceed consumed − already returned.
+    /// </summary>
+    [Range(0.0001, double.MaxValue)]
+    public decimal Qty { get; set; }
+
+    /// <summary>Mandatory, and must be a Production-context reason (FR-MFG-14).</summary>
+    public int? ReasonCodeId { get; set; }
+}
+
+public sealed record ProductionCreatedLayerDto(int LayerId, decimal UnitCost);
+
+public sealed record ReturnLeftoverResultDto(
+    int RunInputId, decimal ReturnedQty, decimal ReturnedValue,
+    ProductionCreatedLayerDto CreatedLayer, IReadOnlyList<int> LedgerRefs, CostPoolDto CostPool);
+
+// --- rejection / rework ------------------------------------------------------
+
+public sealed class RejectRequest
+{
+    [StringLength(500)]
+    public string? Note { get; set; }
+}
+
+/// <summary>One parent whose delivered work was pulled back by a reject-intake (FR-MFG-15).</summary>
+public sealed record PulledBackDto(
+    int RunInputId, int ParentRunStageId, int ParentRunOutputId,
+    decimal Qty, ProductionStageStatus PriorParentStatus, ProductionStageStatus ParentStatus);
+
+public sealed record RejectIntakeResultDto(
+    int RunStageId, ProductionStageStatus Status,
+    IReadOnlyList<PulledBackDto> PulledBack, RunGraphDto Run);
+
+public sealed record TerminalRejectResultDto(
+    int RunStageId, int ReworkCount, RunGraphDto Run);
+
+// --- cancel ------------------------------------------------------------------
+
+public sealed class CancelRunRequest
+{
+    public int? ReasonCodeId { get; set; }
+
+    [StringLength(500)]
+    public string? Note { get; set; }
+}
+
+public sealed record CancelReturnDto(int ItemId, decimal Qty, decimal UnitCost, int LayerId);
+
+/// <summary>
+/// Scrapped output quantities written off by a cancel. Recorded on the event only — scrap
+/// sits on outputs, which never entered stock, so there is nothing to return (FR-MFG-17).
+/// </summary>
+public sealed record ScrapWriteOffDto(int RunOutputId, string Name, decimal Qty);
+
+public sealed record CancelRunResultDto(
+    int RunId, ProductionRunStatus Status,
+    IReadOnlyList<CancelReturnDto> Returns,
+    IReadOnlyList<ScrapWriteOffDto> ScrappedWrittenOff,
+    IReadOnlyList<int> LedgerRefs);

Backend/ERPCore/Dtos/Production/TemplateDtos.cs

@@ -0,0 +1,177 @@
+using System.ComponentModel.DataAnnotations;
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Dtos.Production;
+
+// Production template contract (docs/30-BACKEND-PHASE2.md §D.1).
+//
+// The `Key` vocabulary: every stage and every output carries a client-facing string key
+// alongside its database id. On a GET the key IS the stringified id; on a save the client
+// echoes those keys back for rows it kept and mints "tmp-<uuid>" keys for rows it just
+// drew. Edges and Upstream inputs then reference stages/outputs *by key* only, which is
+// what lets one payload shape — and one validator — serve both POST (nothing has an id
+// yet) and PUT (most things do).
+
+// --- responses ---------------------------------------------------------------
+
+/// <summary>
+/// Row on the template list (docs/30 §D.1 <c>GET /production-templates</c>).
+/// </summary>
+/// <remarks>
+/// <c>StageNames</c> is an addition to the documented shape. The template overview is a
+/// canvas showing every template as a production line with its stages left-to-right
+/// (docs/21 §1), so it needs the names for every listed row — without them the client would
+/// have to fetch each template's full graph just to label the boxes. Ordered by stage id,
+/// matching the graph endpoint.
+/// </remarks>
+public sealed record TemplateSummaryDto(
+    int TemplateId, string Code, string Name, EntityStatus Status,
+    int StageCount, IReadOnlyList<string> StageNames,
+    int ActiveRunCount, int CreatedBy, DateTime CreatedAt);
+
+/// <summary>One custom field definition, serialized verbatim into the stage's <c>field_defs</c> jsonb.</summary>
+public sealed record FieldDefDto(
+    string Key, string Label, CustomFieldType Type, IReadOnlyList<string>? Options, bool Required);
+
+public sealed record StageInputDto(
+    int InputId, StageInputSource Source, int? ItemId,
+    int? FromOutputId, string? FromOutputKey, int UomId, decimal QtyPerBatch);
+
+public sealed record StageOutputDto(
+    int OutputId, string Key, int? ItemId, string Name, int UomId, decimal QtyPerBatch);
+
+public sealed record TemplateStageDto(
+    int StageId, string Key, string Name, string? RoleLabel, int EstimatedMinutes,
+    decimal PosX, decimal PosY, IReadOnlyList<FieldDefDto> FieldDefs,
+    IReadOnlyList<StageInputDto> Inputs, IReadOnlyList<StageOutputDto> Outputs);
+
+public sealed record TemplateEdgeDto(
+    int EdgeId, int ParentStageId, int ChildStageId, string ParentKey, string ChildKey);
+
+/// <summary>
+/// A canvas-only grouping box or divider line. Round-tripped verbatim: no server-side
+/// meaning whatsoever, and invisible to the graph validator.
+/// </summary>
+public sealed record CanvasAnnotationDto(
+    string Kind, decimal PosX, decimal PosY, decimal Width, decimal Height,
+    string? Label, decimal? Rotation);
+
+/// <summary>Full graph (docs/30 §D.1 <c>GET /production-templates/{id}</c>).</summary>
+/// <remarks>
+/// <c>ActiveRunCount</c> and <c>Annotations</c> are additions to the documented shape.
+/// The first is what puts the builder into its edit-locked state (docs/21 §2) and mirrors
+/// the condition <c>UpdateAsync</c> enforces — without it the builder would need a second
+/// request to the list endpoint just to know whether to disable itself.
+/// </remarks>
+public sealed record TemplateGraphDto(
+    int TemplateId, string Code, string Name, string? Description, EntityStatus Status,
+    IReadOnlyList<TemplateStageDto> Stages, IReadOnlyList<TemplateEdgeDto> Edges,
+    IReadOnlyList<CanvasAnnotationDto> Annotations, int ActiveRunCount,
+    int CreatedBy, DateTime CreatedAt);
+
+// --- requests ----------------------------------------------------------------
+// Narrow by design (02-SECURITY §B.6): no status, no ids, no createdBy, no timestamps.
+// POST and PUT share this shape; PUT replaces the whole graph.
+
+public sealed class SaveTemplateRequest
+{
+    [Required, StringLength(30, MinimumLength = 1)]
+    public string Code { get; set; } = string.Empty;
+
+    [Required, StringLength(150, MinimumLength = 1)]
+    public string Name { get; set; } = string.Empty;
+
+    [StringLength(500)]
+    public string? Description { get; set; }
+
+    [Required, MinLength(1)]
+    public List<SaveStageRequest> Stages { get; set; } = new();
+
+    /// <summary>Empty is legal — a single-stage template is both entry and terminal.</summary>
+    public List<SaveEdgeRequest> Edges { get; set; } = new();
+
+    /// <summary>
+    /// Canvas boxes/lines. Capped because this is free-form client state going into a jsonb
+    /// column — a hand-rolled request should not be able to store an unbounded blob.
+    /// </summary>
+    [MaxLength(200)]
+    public List<CanvasAnnotationDto> Annotations { get; set; } = new();
+}
+
+public sealed class SaveStageRequest
+{
+    /// <summary>Existing stage id as a string, or a client-minted <c>tmp-*</c> key for a new stage.</summary>
+    [Required, StringLength(60, MinimumLength = 1)]
+    public string Key { get; set; } = string.Empty;
+
+    [Required, StringLength(150, MinimumLength = 1)]
+    public string Name { get; set; } = string.Empty;
+
+    [StringLength(60)]
+    public string? RoleLabel { get; set; }
+
+    [Range(0, 1_000_000)]
+    public int EstimatedMinutes { get; set; }
+
+    /// <summary>Canvas coordinates, stored verbatim and never interpreted server-side.</summary>
+    public decimal PosX { get; set; }
+    public decimal PosY { get; set; }
+
+    public List<FieldDefDto> FieldDefs { get; set; } = new();
+    public List<SaveInputRequest> Inputs { get; set; } = new();
+    public List<SaveOutputRequest> Outputs { get; set; } = new();
+}
+
+public sealed class SaveInputRequest
+{
+    [Required]
+    public StageInputSource Source { get; set; }
+
+    /// <summary>Required when <see cref="Source"/> is Stock; must be null when Upstream.</summary>
+    public int? ItemId { get; set; }
+
+    /// <summary>Required when <see cref="Source"/> is Upstream; must name an output of a direct parent.</summary>
+    [StringLength(60)]
+    public string? FromOutputKey { get; set; }
+
+    [Range(1, int.MaxValue)]
+    public int UomId { get; set; }
+
+    [Range(0.0001, double.MaxValue)]
+    public decimal QtyPerBatch { get; set; }
+}
+
+public sealed class SaveOutputRequest
+{
+    /// <summary>Existing output id as a string, or a <c>tmp-*</c> key. Referenced by Upstream inputs.</summary>
+    [Required, StringLength(60, MinimumLength = 1)]
+    public string Key { get; set; } = string.Empty;
+
+    /// <summary>Required on the terminal stage's single output; must be null on every other output.</summary>
+    public int? ItemId { get; set; }
+
+    [Required, StringLength(150, MinimumLength = 1)]
+    public string Name { get; set; } = string.Empty;
+
+    [Range(1, int.MaxValue)]
+    public int UomId { get; set; }
+
+    [Range(0.0001, double.MaxValue)]
+    public decimal QtyPerBatch { get; set; }
+}
+
+public sealed class SaveEdgeRequest
+{
+    [Required, StringLength(60, MinimumLength = 1)]
+    public string ParentKey { get; set; } = string.Empty;
+
+    [Required, StringLength(60, MinimumLength = 1)]
+    public string ChildKey { get; set; } = string.Empty;
+}
+
+/// <summary>Body of <c>PATCH /production-templates/{id}/status</c> (docs/30 §D.1).</summary>
+public sealed class UpdateTemplateStatusRequest
+{
+    [Required]
+    public EntityStatus Status { get; set; }
+}

Backend/ERPCore/Dtos/Sales/BundleSaleDtos.cs

@@ -0,0 +1,84 @@
+using System.ComponentModel.DataAnnotations;
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Dtos.Sales;
+
+public sealed record BundleSaleLineDto(
+    int BundleSaleLineId, int ItemId, string Description, decimal Qty, int UomId, int WarehouseId,
+    decimal UnitPrice, decimal LineTotal, bool IncludeInBundle, bool IsComponent, int? ParentLineId);
+
+public sealed record BundleSaleDto(
+    int BundleSaleId, string BundleNo, DateTime BundleDate, int CustomerId, string CustomerSnapshotName,
+    int WarehouseId, int CashierUserId, int BundleSaleTemplateId, string BundleName, string BundleCode,
+    BundleSaleStatus Status, decimal ComponentSubtotal, decimal BundlePrice, decimal MarginAmount,
+    decimal DiscountTotal, decimal TaxTotal, decimal GrandTotal, DateTime CreatedAt, DateTime? UpdatedAt,
+    IReadOnlyList<BundleSaleLineDto> Lines);
+
+public sealed record BundleSaleSummaryDto(
+    int BundleSaleId, string BundleNo, DateTime BundleDate, int CustomerId, string CustomerSnapshotName,
+    int WarehouseId, string BundleName, string BundleCode, BundleSaleStatus Status,
+    decimal ComponentSubtotal, decimal BundlePrice, decimal GrandTotal, DateTime CreatedAt);
+
+public sealed record BundleSaleTemplateLineDto(
+    int BundleSaleTemplateLineId, int ItemId, int UomId, int WarehouseId, decimal Qty,
+    decimal UnitPrice, bool IncludeInBundle, int SortOrder);
+
+public sealed record BundleSaleTemplateDto(
+    int BundleSaleTemplateId, string TemplateCode, string TemplateName, string? Description,
+    EntityStatus Status, DateTime CreatedAt, DateTime? UpdatedAt, IReadOnlyList<BundleSaleTemplateLineDto> Lines);
+
+public sealed record BundleSaleTemplateSummaryDto(
+    int BundleSaleTemplateId, string TemplateCode, string TemplateName, string? Description,
+    EntityStatus Status, int LineCount, DateTime CreatedAt, DateTime? UpdatedAt);
+
+/// <summary>Quantities are in the item's base UOM — see <c>SalesInvoicePostingIssueDto</c>.</summary>
+public sealed record BundleSalePostingIssueDto(
+    int BundleSaleLineId, int ItemId, string ItemSku, string ItemName, int WarehouseId,
+    decimal RequestedQty, decimal AvailableQty, decimal ShortQty, string BaseUomName = "");
+
+public sealed record BundleSalePostingCheckDto(
+    int BundleSaleId, string BundleNo, BundleSaleStatus Status, bool CanPost,
+    IReadOnlyList<BundleSalePostingIssueDto> Issues);
+
+public sealed class CreateBundleSaleTemplateLineRequest
+{
+    [Required] public int ItemId { get; set; }
+    [Required] public int UomId { get; set; }
+    [Required] public int WarehouseId { get; set; }
+    [Range(0.0001, double.MaxValue)] public decimal Qty { get; set; }
+    [Range(0, double.MaxValue)] public decimal UnitPrice { get; set; }
+    public bool IncludeInBundle { get; set; } = true;
+    public int SortOrder { get; set; }
+}
+
+public sealed class CreateBundleSaleTemplateRequest
+{
+    [Required] public string TemplateCode { get; set; } = string.Empty;
+    [Required] public string TemplateName { get; set; } = string.Empty;
+    public string? Description { get; set; }
+    [Required, MinLength(1)] public List<CreateBundleSaleTemplateLineRequest> Lines { get; set; } = new();
+}
+
+public sealed class CreateBundleSaleRequest
+{
+    [Required] public int CustomerId { get; set; }
+    [Required] public int WarehouseId { get; set; }
+    [Required] public int CashierUserId { get; set; }
+    [Required] public int BundleSaleTemplateId { get; set; }
+    [Required] public string BundleName { get; set; } = string.Empty;
+    [Range(0, double.MaxValue)] public decimal BundlePrice { get; set; }
+    public bool AllowPriceOverride { get; set; }
+    [Required, MinLength(1)] public List<CreateBundleSaleTemplateLineRequest> Lines { get; set; } = new();
+}
+
+public sealed class UpdateBundleSaleRequest
+{
+    [Required] public int CustomerId { get; set; }
+    [Required] public int WarehouseId { get; set; }
+    [Required] public int CashierUserId { get; set; }
+    [Required] public int BundleSaleTemplateId { get; set; }
+    [Required] public string BundleName { get; set; } = string.Empty;
+    [Range(0, double.MaxValue)] public decimal BundlePrice { get; set; }
+    public bool AllowPriceOverride { get; set; }
+    [Required, MinLength(1)] public List<CreateBundleSaleTemplateLineRequest> Lines { get; set; } = new();
+}

Backend/ERPCore/Dtos/Sales/SalesInvoiceDtos.cs

@@ -0,0 +1,74 @@
+using System.ComponentModel.DataAnnotations;
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Dtos.Sales;
+
+public sealed record SalesInvoiceLineDto(
+    int SalesInvoiceLineId, int ItemId, string Description, decimal Qty, decimal FreeQty, int UomId,
+    int WarehouseId, decimal UnitPrice, decimal BaseCost, string PriceSource, decimal DiscountPct,
+    decimal DiscountAmount, SalesDiscountMode DiscountMode, decimal NetUnitPrice, decimal LineTotal,
+    decimal TaxPct, decimal TaxAmount, bool IsFreeIssue, int? ParentLineId);
+
+public sealed record SalesInvoiceTotalsDto(
+    decimal Subtotal, decimal DiscountTotal, decimal FreeQtyTotal, decimal TaxTotal, decimal GrandTotal,
+    decimal RoundOff, decimal NetPayable, decimal PaidAmount, decimal BalanceAmount);
+
+public sealed record SalesInvoiceDto(
+    int SalesInvoiceId, string InvoiceNo, DateTime InvoiceDate, int CustomerId,
+    string CustomerSnapshotName, string? CustomerSnapshotTaxNo, int WarehouseId,
+    SalesInvoiceType InvoiceType, SalesInvoiceStatus Status, int CreatedBy, DateTime CreatedAt,
+    DateTime? UpdatedAt, SalesInvoiceTotalsDto Totals, IReadOnlyList<SalesInvoiceLineDto> Lines);
+
+public sealed record SalesInvoiceSummaryDto(
+    int SalesInvoiceId, string InvoiceNo, DateTime InvoiceDate, int CustomerId,
+    string CustomerSnapshotName, int WarehouseId, SalesInvoiceType InvoiceType,
+    SalesInvoiceStatus Status, SalesInvoiceTotalsDto Totals, DateTime CreatedAt);
+
+/// <summary>
+/// A line that cannot be posted for lack of stock. The three quantities are in the item's
+/// <b>base</b> UOM (on-hand only exists in base), which may differ from the UOM shown on the
+/// line — hence <paramref name="BaseUomName"/>: without it a line reading "2 BOX" produces
+/// an unexplained "requested 24, available 10".
+/// </summary>
+public sealed record SalesInvoicePostingIssueDto(
+    int SalesInvoiceLineId, int ItemId, string ItemSku, string ItemName, int WarehouseId,
+    decimal RequestedQty, decimal AvailableQty, decimal ShortQty, bool IsFreeIssue,
+    string BaseUomName = "");
+
+public sealed record SalesInvoicePostingCheckDto(
+    int SalesInvoiceId, string InvoiceNo, SalesInvoiceStatus Status, bool CanPost,
+    IReadOnlyList<SalesInvoicePostingIssueDto> Issues);
+
+public sealed class CreateSalesInvoiceLineRequest
+{
+    [Required] public int ItemId { get; set; }
+    [Required] public int UomId { get; set; }
+    [Required] public int WarehouseId { get; set; }
+    [Range(0.0001, double.MaxValue)] public decimal Qty { get; set; }
+    [Range(0, double.MaxValue)] public decimal FreeQty { get; set; }
+    [Range(0, double.MaxValue)] public decimal? UnitPrice { get; set; }
+    public bool AllowManualPriceOverride { get; set; }
+    [Required, EnumDataType(typeof(SalesDiscountMode))] public SalesDiscountMode DiscountMode { get; set; } = SalesDiscountMode.Percentage;
+    [Range(0, 100)] public decimal DiscountPct { get; set; }
+    [Range(0, double.MaxValue)] public decimal DiscountAmount { get; set; }
+    [Range(0, double.MaxValue)] public decimal DiscountValue { get; set; }
+    [Range(0, 100)] public decimal TaxPct { get; set; }
+    public bool IsFreeIssue { get; set; }
+    public int? ParentLineId { get; set; }
+}
+
+public sealed class CreateSalesInvoiceRequest
+{
+    [Required] public int CustomerId { get; set; }
+    [Required] public int WarehouseId { get; set; }
+    [Required, EnumDataType(typeof(SalesInvoiceType))] public SalesInvoiceType InvoiceType { get; set; } = SalesInvoiceType.B2C;
+    [Required, MinLength(1)] public List<CreateSalesInvoiceLineRequest> Lines { get; set; } = new();
+}
+
+public sealed class UpdateSalesInvoiceRequest
+{
+    [Required] public int CustomerId { get; set; }
+    [Required] public int WarehouseId { get; set; }
+    [Required, EnumDataType(typeof(SalesInvoiceType))] public SalesInvoiceType InvoiceType { get; set; } = SalesInvoiceType.B2C;
+    [Required, MinLength(1)] public List<CreateSalesInvoiceLineRequest> Lines { get; set; } = new();
+}

Backend/ERPCore/Dtos/Sales/SalesPromotionSuggestionDtos.cs

@@ -0,0 +1,23 @@
+namespace ERPCore.Dtos.Sales;
+
+public sealed record SalesFreeIssueRewardOptionDto(
+    int ItemId,
+    string Sku,
+    string Name,
+    decimal? SalePrice);
+
+public sealed record SalesFreeIssueSuggestionLineDto(
+    int SalesSlipLineId,
+    int ItemId,
+    string ItemSku,
+    string ItemName,
+    decimal Qty,
+    decimal SuggestedFreeQty,
+    decimal TriggerQty,
+    IReadOnlyList<SalesFreeIssueRewardOptionDto> RewardOptions);
+
+public sealed record SalesFreeIssueSuggestionDto(
+    int SalesSlipId,
+    string SlipNo,
+    DateTime SlipDate,
+    IReadOnlyList<SalesFreeIssueSuggestionLineDto> Lines);

Backend/ERPCore/Dtos/Sales/SalesReportDtos.cs

@@ -0,0 +1,68 @@
+namespace ERPCore.Dtos.Sales;
+
+public sealed record SalesDailySummaryRowDto(
+    DateOnly Date,
+    int InvoiceCount,
+    int SlipCount,
+    decimal InvoiceSubtotal,
+    decimal SlipSubtotal,
+    decimal DiscountTotal,
+    decimal FreeQtyTotal,
+    decimal TaxTotal,
+    decimal GrandTotal);
+
+public sealed record SalesItemSummaryRowDto(
+    int ItemId,
+    string ItemName,
+    decimal SoldQty,
+    decimal FreeQty,
+    decimal GrossAmount,
+    decimal DiscountTotal,
+    decimal TaxTotal,
+    decimal NetAmount);
+
+public sealed record SalesCustomerSummaryRowDto(
+    int CustomerId,
+    string CustomerName,
+    int InvoiceCount,
+    int SlipCount,
+    decimal SoldQty,
+    decimal FreeQty,
+    decimal GrossAmount,
+    decimal DiscountTotal,
+    decimal TaxTotal,
+    decimal NetAmount);
+
+public sealed record SalesWarehouseSummaryRowDto(
+    int WarehouseId,
+    string WarehouseName,
+    int InvoiceCount,
+    int SlipCount,
+    decimal SoldQty,
+    decimal FreeQty,
+    decimal GrossAmount,
+    decimal DiscountTotal,
+    decimal TaxTotal,
+    decimal NetAmount);
+
+public sealed record SalesDiscountSummaryRowDto(
+    string DocumentType,
+    string DocumentNo,
+    DateTime DocumentDate,
+    string CustomerName,
+    decimal Subtotal,
+    decimal DiscountTotal,
+    decimal TaxTotal,
+    decimal NetAmount);
+
+public sealed record SalesFreeIssueSummaryRowDto(
+    string DocumentType,
+    string DocumentNo,
+    DateTime DocumentDate,
+    string CustomerName,
+    int ItemId,
+    string ItemName,
+    decimal FreeQty,
+    decimal FreeValue,
+    int WarehouseId,
+    string WarehouseName);

Backend/ERPCore/Dtos/Sales/SalesReportQueryDtos.cs

@@ -0,0 +1,21 @@
+namespace ERPCore.Dtos.Sales;
+
+public sealed record SalesReportDefinitionDto(
+    string Id,
+    string Name,
+    string Description,
+    IReadOnlyList<string> SupportedFilters);
+
+public sealed record SalesReportQueryRequest(
+    string ReportType,
+    DateOnly From,
+    DateOnly To,
+    int? ItemId = null,
+    int? CustomerId = null,
+    int? WarehouseId = null);
+
+public sealed record SalesReportQueryResponse(
+    string ReportType,
+    DateOnly From,
+    DateOnly To,
+    IReadOnlyList<object> Rows);

Backend/ERPCore/Dtos/Sales/SalesSlipDtos.cs

@@ -0,0 +1,79 @@
+using System.ComponentModel.DataAnnotations;
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Dtos.Sales;
+
+public sealed record SalesSlipLineDto(
+    int SalesSlipLineId, int ItemId, string Description, decimal Qty, decimal FreeQty, int UomId,
+    int WarehouseId, decimal UnitPrice, decimal BaseCost, string PriceSource, decimal DiscountPct,
+    decimal DiscountAmount, SalesDiscountMode DiscountMode, decimal NetUnitPrice, decimal LineTotal,
+    decimal TaxPct, decimal TaxAmount, bool IsFreeIssue, int? ParentLineId);
+
+public sealed record SalesSlipTotalsDto(
+    decimal Subtotal, decimal DiscountTotal, decimal FreeQtyTotal, decimal TaxTotal, decimal GrandTotal,
+    decimal PaidAmount, decimal BalanceAmount);
+
+public sealed record SalesSlipDto(
+    int SalesSlipId, string SlipNo, DateTime SlipDate, int CustomerId,
+    string CustomerSnapshotName, int WarehouseId, int CashierUserId, SalesSlipStatus Status,
+    DateTime CreatedAt, DateTime? UpdatedAt, SalesSlipTotalsDto Totals, IReadOnlyList<SalesSlipLineDto> Lines);
+
+public sealed record SalesSlipSummaryDto(
+    int SalesSlipId, string SlipNo, DateTime SlipDate, int CustomerId,
+    string CustomerSnapshotName, int WarehouseId, SalesSlipStatus Status,
+    SalesSlipTotalsDto Totals, DateTime CreatedAt);
+
+/// <summary>Quantities are in the item's base UOM — see <c>SalesInvoicePostingIssueDto</c>.</summary>
+public sealed record SalesSlipPostingIssueDto(
+    int SalesSlipLineId, int ItemId, string ItemSku, string ItemName, int WarehouseId,
+    decimal RequestedQty, decimal AvailableQty, decimal ShortQty, bool IsFreeIssue,
+    string BaseUomName = "");
+
+public sealed record SalesSlipPostingCheckDto(
+    int SalesSlipId, string SlipNo, SalesSlipStatus Status, bool CanPost,
+    IReadOnlyList<SalesSlipPostingIssueDto> Issues);
+
+public sealed record FreeIssueSummaryDto(
+    int SalesSlipId, string SlipNo, SalesSlipStatus Status, DateTime CreatedAt,
+    int WarehouseId, string WarehouseName, int ItemId, string ItemSku, string ItemName,
+    int UomId, string UomName, decimal Qty, decimal FreeQty, string SchemeLabel);
+
+public sealed record FreeIssueDto(
+    int SalesSlipId, string SlipNo, DateTime SlipDate, SalesSlipStatus Status,
+    int CustomerId, string CustomerSnapshotName, int WarehouseId, string WarehouseName,
+    int CashierUserId, DateTime CreatedAt, DateTime? UpdatedAt, FreeIssueSummaryDto Summary,
+    IReadOnlyList<SalesSlipLineDto> Lines);
+
+public sealed class CreateSalesSlipLineRequest
+{
+    [Required] public int ItemId { get; set; }
+    [Required] public int UomId { get; set; }
+    [Required] public int WarehouseId { get; set; }
+    [Range(0.0001, double.MaxValue)] public decimal Qty { get; set; }
+    [Range(0, double.MaxValue)] public decimal FreeQty { get; set; }
+    [Range(0, double.MaxValue)] public decimal? UnitPrice { get; set; }
+    public bool AllowManualPriceOverride { get; set; }
+    [Required, EnumDataType(typeof(SalesDiscountMode))] public SalesDiscountMode DiscountMode { get; set; } = SalesDiscountMode.Percentage;
+    [Range(0, 100)] public decimal DiscountPct { get; set; }
+    [Range(0, double.MaxValue)] public decimal DiscountAmount { get; set; }
+    [Range(0, double.MaxValue)] public decimal DiscountValue { get; set; }
+    [Range(0, 100)] public decimal TaxPct { get; set; }
+    public bool IsFreeIssue { get; set; }
+    public int? ParentLineId { get; set; }
+}
+
+public sealed class CreateSalesSlipRequest
+{
+    [Required] public int CustomerId { get; set; }
+    [Required] public int WarehouseId { get; set; }
+    [Required] public int CashierUserId { get; set; }
+    [Required, MinLength(1)] public List<CreateSalesSlipLineRequest> Lines { get; set; } = new();
+}
+
+public sealed class UpdateSalesSlipRequest
+{
+    [Required] public int CustomerId { get; set; }
+    [Required] public int WarehouseId { get; set; }
+    [Required] public int CashierUserId { get; set; }
+    [Required, MinLength(1)] public List<CreateSalesSlipLineRequest> Lines { get; set; } = new();
+}

Backend/ERPCore/Dtos/Stock/StockDtos.cs

@@ -2,16 +2,23 @@ using ERPCore.Domain.Enums;
 
 namespace ERPCore.Dtos.Stock;
 
+// Every quantity a stock endpoint returns is in the item's base UOM — stock, layers and the
+// ledger are base-only by construction. The BaseUomId/BaseUomName pair on each of these DTOs
+// exists so a client can *label* those figures; without it every stock screen renders a bare
+// number the user has to guess the unit of. They are never a conversion instruction.
+
 /// <summary>Stock enquiry (docs/11 §5.1). available = onHand − onHold − reserved − inTransit(out).</summary>
 public sealed record StockOnHandDto(
     int ItemId, int WarehouseId, decimal OnHand, decimal Available,
-    decimal OnHold, decimal InTransit, decimal Reserved, DateTime AsOf);
+    decimal OnHold, decimal InTransit, decimal Reserved, DateTime AsOf,
+    int BaseUomId = 0, string BaseUomName = "");
 
 /// <summary>A stock-ledger row (docs/11 §5.2).</summary>
 public sealed record StockLedgerRowDto(
     int LedgerId, int ItemId, int WarehouseId, int? BinId, int? BatchId, int? SerialId,
     Direction Direction, decimal QtyBase, decimal UnitCost, decimal Value, decimal RunningBalance,
-    string SourceDocType, int SourceDocId, int UserId, DateTime CreatedAt);
+    string SourceDocType, int SourceDocId, int UserId, DateTime CreatedAt,
+    int BaseUomId = 0, string BaseUomName = "");
 
 /// <summary>An open FIFO layer in a valuation (docs/11 §5.3).</summary>
 public sealed record StockValuationLayerDto(int LayerId, decimal QtyRemaining, decimal UnitCost, decimal Value, DateTime ReceiptDate);
@@ -19,4 +26,5 @@ public sealed record StockValuationLayerDto(int LayerId, decimal QtyRemaining, d
 /// <summary>Valuation of on-hand stock from open FIFO layers (docs/11 §5.3).</summary>
 public sealed record StockValuationDto(
     int ItemId, int WarehouseId, IReadOnlyList<StockValuationLayerDto> Layers,
-    decimal TotalQty, decimal TotalValue, string Currency, string CostingMethod);
+    decimal TotalQty, decimal TotalValue, string Currency, string CostingMethod,
+    int BaseUomId = 0, string BaseUomName = "");

Backend/ERPCore/Dtos/Uoms/UomDtos.cs

@@ -9,3 +9,12 @@ public sealed class CreateUomRequest
 {
     [Required, StringLength(50)] public string Name { get; set; } = string.Empty;
 }
+
+/// <summary>
+/// A UOM an item may actually be transacted in: its base UOM (<paramref name="Factor"/> 1,
+/// <paramref name="IsBase"/> true) plus every UOM it has a conversion from. Backs both
+/// entry-time validation and <c>GET /items/{itemId}/uoms</c>, so the client can offer only
+/// units that will survive posting instead of the whole global list.
+/// </summary>
+/// <param name="Factor">Multiply a quantity in this UOM by <paramref name="Factor"/> to get base UOM.</param>
+public sealed record AllowedUomDto(int UomId, string Name, decimal Factor, bool IsBase);

Backend/ERPCore/Infra/Gl/GeneralLedgerClient.cs

@@ -0,0 +1,55 @@
+using ERPCore.System.Errors;
+
+namespace ERPCore.Infra.Gl;
+
+/// <summary>
+/// HTTP implementation of <see cref="IGeneralLedgerClient"/>. Registered as a typed
+/// client (`AddHttpClient&lt;IGeneralLedgerClient, GeneralLedgerClient&gt;`) with its
+/// `BaseAddress` bound from `GeneralLedgerService:BaseUrl`. Every call attaches the
+/// shared `GeneralLedgerService:ApiKey` as `X-Api-Key` and streams the request/response
+/// body straight through, unparsed — GL's own response (status, content-type, body) is
+/// returned exactly as received; nothing here reshapes it.
+/// </summary>
+public sealed class GeneralLedgerClient(HttpClient http, IConfiguration configuration) : IGeneralLedgerClient
+{
+    private readonly HttpClient _http = http;
+    private readonly string _apiKey = configuration["GeneralLedgerService:ApiKey"] ?? string.Empty;
+
+    public async Task<GeneralLedgerResponse> SendAsync(
+        HttpMethod method, string path, string? queryString, string? contentType, Stream? body, CancellationToken ct)
+    {
+        var relativeUri = path.TrimStart('/') + queryString;
+        using var request = new HttpRequestMessage(method, relativeUri);
+        request.Headers.TryAddWithoutValidation("X-Api-Key", _apiKey);
+
+        if (body is not null && method != HttpMethod.Get)
+        {
+            var content = new StreamContent(body);
+            if (!string.IsNullOrEmpty(contentType))
+                content.Headers.TryAddWithoutValidation("Content-Type", contentType);
+            request.Content = content;
+        }
+
+        HttpResponseMessage response;
+        try
+        {
+            response = await _http.SendAsync(request, ct);
+        }
+        catch (HttpRequestException)
+        {
+            throw new DomainException(ErrorCodes.GlServiceUnavailable, "The General Ledger service is unreachable.", 503);
+        }
+        catch (TaskCanceledException) when (!ct.IsCancellationRequested)
+        {
+            throw new DomainException(ErrorCodes.GlServiceUnavailable, "The General Ledger service timed out.", 503);
+        }
+
+        var responseBody = await response.Content.ReadAsStringAsync(ct);
+        return new GeneralLedgerResponse
+        {
+            StatusCode = (int)response.StatusCode,
+            ContentType = response.Content.Headers.ContentType?.ToString(),
+            Body = responseBody
+        };
+    }
+}

Backend/ERPCore/Infra/Gl/GeneralLedgerResponse.cs

@@ -0,0 +1,15 @@
+namespace ERPCore.Infra.Gl;
+
+/// <summary>
+/// Raw HTTP result from the external General Ledger service — status code, content
+/// type, and body exactly as GL returned them. Deliberately un-reshaped: GL's own
+/// envelope (see the GL service's own API reference) is passed through byte-for-byte
+/// so its camelCase-success/PascalCase-error inconsistency and full decimal precision
+/// survive the hop unchanged (docs/12-GENERAL-LEDGER-INTEGRATION.md).
+/// </summary>
+public sealed class GeneralLedgerResponse
+{
+    public int StatusCode { get; init; }
+    public string? ContentType { get; init; }
+    public string Body { get; init; } = string.Empty;
+}

Backend/ERPCore/Infra/Gl/IGeneralLedgerClient.cs

@@ -0,0 +1,13 @@
+namespace ERPCore.Infra.Gl;
+
+/// <summary>
+/// Typed HTTP transport to the external General Ledger service. Injects the shared
+/// `X-Api-Key` secret and forwards method/path/query/body/content-type verbatim —
+/// see docs/12-GENERAL-LEDGER-INTEGRATION.md. Internal: only
+/// <see cref="ERPCore.Services.Interfaces.IGeneralLedgerService"/> consumes this.
+/// </summary>
+public interface IGeneralLedgerClient
+{
+    Task<GeneralLedgerResponse> SendAsync(
+        HttpMethod method, string path, string? queryString, string? contentType, Stream? body, CancellationToken ct);
+}

Backend/ERPCore/Infra/Persistence/Configurations/BundleSaleConfiguration.cs

@@ -0,0 +1,46 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+public sealed class BundleSaleConfiguration : IEntityTypeConfiguration<BundleSale>
+{
+    public void Configure(EntityTypeBuilder<BundleSale> builder)
+    {
+        builder.ToTable("bundle_sales");
+        builder.HasKey(x => x.BundleSaleId);
+        builder.Property(x => x.BundleNo).IsRequired().HasMaxLength(50);
+        builder.HasIndex(x => x.BundleNo).IsUnique();
+        builder.Property(x => x.BundleDate).IsRequired();
+        builder.Property(x => x.CustomerSnapshotName).IsRequired().HasMaxLength(200);
+        builder.Property(x => x.BundleName).IsRequired().HasMaxLength(200);
+        builder.Property(x => x.BundleCode).IsRequired().HasMaxLength(50);
+        builder.Property(x => x.Status)
+            .HasConversion<string>().HasMaxLength(20).IsRequired()
+            .HasDefaultValue(BundleSaleStatus.Draft);
+        builder.Property(x => x.ComponentSubtotal).HasPrecision(18, 4);
+        builder.Property(x => x.BundlePrice).HasPrecision(18, 4);
+        builder.Property(x => x.MarginAmount).HasPrecision(18, 4);
+        builder.Property(x => x.DiscountTotal).HasPrecision(18, 4);
+        builder.Property(x => x.TaxTotal).HasPrecision(18, 4);
+        builder.Property(x => x.GrandTotal).HasPrecision(18, 4);
+        builder.Property(x => x.CreatedAt).IsRequired();
+        builder.Property(x => x.ConcurrencyStamp)
+            .IsRequired()
+            .HasColumnType("integer")
+            .HasDefaultValue(0)
+            .IsConcurrencyToken();
+
+        builder.HasOne(x => x.Customer).WithMany().HasForeignKey(x => x.CustomerId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(x => x.Warehouse).WithMany().HasForeignKey(x => x.WarehouseId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(x => x.CashierUser).WithMany().HasForeignKey(x => x.CashierUserId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(x => x.BundleSaleTemplate).WithMany().HasForeignKey(x => x.BundleSaleTemplateId).OnDelete(DeleteBehavior.Restrict);
+
+        builder.HasMany(x => x.Lines)
+            .WithOne(x => x.BundleSale)
+            .HasForeignKey(x => x.BundleSaleId)
+            .OnDelete(DeleteBehavior.Cascade);
+    }
+}

Backend/ERPCore/Infra/Persistence/Configurations/BundleSaleLineConfiguration.cs

@@ -0,0 +1,26 @@
+using ERPCore.Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+public sealed class BundleSaleLineConfiguration : IEntityTypeConfiguration<BundleSaleLine>
+{
+    public void Configure(EntityTypeBuilder<BundleSaleLine> builder)
+    {
+        builder.ToTable("bundle_sale_lines");
+        builder.HasKey(x => x.BundleSaleLineId);
+        builder.Property(x => x.Description).IsRequired().HasMaxLength(200);
+        builder.Property(x => x.Qty).HasPrecision(18, 4);
+        builder.Property(x => x.QtyBase).HasPrecision(18, 4);
+        builder.Property(x => x.ConversionFactor).HasPrecision(18, 6).HasDefaultValue(1m);
+        builder.Property(x => x.UnitPrice).HasPrecision(18, 4);
+        builder.Property(x => x.LineTotal).HasPrecision(18, 4);
+        builder.Property(x => x.IncludeInBundle).HasDefaultValue(true);
+        builder.Property(x => x.IsComponent).HasDefaultValue(true);
+
+        builder.HasOne(x => x.Item).WithMany().HasForeignKey(x => x.ItemId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(x => x.Uom).WithMany().HasForeignKey(x => x.UomId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(x => x.Warehouse).WithMany().HasForeignKey(x => x.WarehouseId).OnDelete(DeleteBehavior.Restrict);
+    }
+}

Backend/ERPCore/Infra/Persistence/Configurations/BundleSaleTemplateConfiguration.cs

@@ -0,0 +1,34 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+public sealed class BundleSaleTemplateConfiguration : IEntityTypeConfiguration<BundleSaleTemplate>
+{
+    public void Configure(EntityTypeBuilder<BundleSaleTemplate> builder)
+    {
+        builder.ToTable("bundle_sale_templates");
+        builder.HasKey(x => x.BundleSaleTemplateId);
+
+        builder.Property(x => x.TemplateCode).IsRequired().HasMaxLength(50);
+        builder.HasIndex(x => x.TemplateCode).IsUnique();
+        builder.Property(x => x.TemplateName).IsRequired().HasMaxLength(200);
+        builder.Property(x => x.Description).HasMaxLength(1000);
+        builder.Property(x => x.Status)
+            .HasConversion<string>().HasMaxLength(20).IsRequired()
+            .HasDefaultValue(EntityStatus.Active);
+        builder.Property(x => x.CreatedAt).IsRequired();
+        builder.Property(x => x.ConcurrencyStamp)
+            .IsRequired()
+            .HasColumnType("integer")
+            .HasDefaultValue(0)
+            .IsConcurrencyToken();
+
+        builder.HasMany(x => x.Lines)
+            .WithOne(x => x.BundleSaleTemplate)
+            .HasForeignKey(x => x.BundleSaleTemplateId)
+            .OnDelete(DeleteBehavior.Cascade);
+    }
+}

Backend/ERPCore/Infra/Persistence/Configurations/BundleSaleTemplateLineConfiguration.cs

@@ -0,0 +1,21 @@
+using ERPCore.Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+public sealed class BundleSaleTemplateLineConfiguration : IEntityTypeConfiguration<BundleSaleTemplateLine>
+{
+    public void Configure(EntityTypeBuilder<BundleSaleTemplateLine> builder)
+    {
+        builder.ToTable("bundle_sale_template_lines");
+        builder.HasKey(x => x.BundleSaleTemplateLineId);
+        builder.Property(x => x.Qty).HasPrecision(18, 4);
+        builder.Property(x => x.UnitPrice).HasPrecision(18, 4);
+        builder.Property(x => x.SortOrder).HasDefaultValue(0);
+
+        builder.HasOne(x => x.Item).WithMany().HasForeignKey(x => x.ItemId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(x => x.Uom).WithMany().HasForeignKey(x => x.UomId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(x => x.Warehouse).WithMany().HasForeignKey(x => x.WarehouseId).OnDelete(DeleteBehavior.Restrict);
+    }
+}

Backend/ERPCore/Infra/Persistence/Configurations/CustomerConfiguration.cs

@@ -0,0 +1,50 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+public sealed class CustomerConfiguration : IEntityTypeConfiguration<Customer>
+{
+    public void Configure(EntityTypeBuilder<Customer> builder)
+    {
+        builder.ToTable("customers");
+        builder.HasKey(c => c.CustomerId);
+
+        builder.Property(c => c.CustomerCode).IsRequired().HasMaxLength(50);
+        builder.HasIndex(c => c.CustomerCode).IsUnique();
+
+        builder.Property(c => c.CustomerType)
+            .HasConversion<string>().HasMaxLength(20).IsRequired()
+            .HasDefaultValue(CustomerType.B2C);
+
+        builder.Property(c => c.Name).IsRequired().HasMaxLength(200);
+        builder.Property(c => c.DisplayName).HasMaxLength(200);
+        builder.Property(c => c.Phone).HasMaxLength(30);
+        builder.Property(c => c.Email).HasMaxLength(100);
+        builder.Property(c => c.AddressLine1).HasMaxLength(250);
+        builder.Property(c => c.AddressLine2).HasMaxLength(250);
+        builder.Property(c => c.City).HasMaxLength(100);
+        builder.Property(c => c.Country).HasMaxLength(100);
+        builder.Property(c => c.TaxRegistrationNo).HasMaxLength(50);
+
+        builder.Property(c => c.CreditLimit).HasPrecision(18, 4);
+        builder.Property(c => c.CreditDays).IsRequired();
+
+        builder.HasOne(c => c.DefaultWarehouse)
+            .WithMany()
+            .HasForeignKey(c => c.DefaultWarehouseId)
+            .OnDelete(DeleteBehavior.SetNull);
+
+        builder.Property(c => c.Status)
+            .HasConversion<string>().HasMaxLength(20).IsRequired()
+            .HasDefaultValue(EntityStatus.Active);
+
+        builder.Property(c => c.CreatedAt).IsRequired();
+        builder.Property(c => c.RowVersion).IsRowVersion();
+
+        builder.HasIndex(c => c.Status);
+        builder.HasIndex(c => c.CustomerType);
+    }
+}

Backend/ERPCore/Infra/Persistence/Configurations/GrnConfiguration.cs

@@ -36,6 +36,8 @@ public sealed class GrnLineConfiguration : IEntityTypeConfiguration<GrnLine>
         builder.HasKey(l => l.GrnLineId);
 
         builder.Property(l => l.Qty).HasPrecision(18, 4);
+        builder.Property(l => l.QtyBase).HasPrecision(18, 4);
+        builder.Property(l => l.ConversionFactor).HasPrecision(18, 6).HasDefaultValue(1m);
         builder.Property(l => l.UnitCost).HasPrecision(18, 6);
         builder.Property(l => l.PoUnitPrice).HasPrecision(18, 6);
         builder.Property(l => l.DiscountPct).HasPrecision(9, 4);

Backend/ERPCore/Infra/Persistence/Configurations/NavItemConfiguration.cs

@@ -36,7 +36,10 @@ public sealed class NavItemConfiguration : IEntityTypeConfiguration<NavItem>
             new NavItem { NavItemId = 7, Code = "warehouses", Label = "Warehouses", Href = "/dashboard/warehouse", SortOrder = 7 },
             new NavItem { NavItemId = 8, Code = "orders", Label = "Orders", Href = "/dashboard/orders", SortOrder = 8 },
             new NavItem { NavItemId = 9, Code = "settings", Label = "Settings", Href = "/dashboard/settings", SortOrder = 9 },
-            new NavItem { NavItemId = 10, Code = "help", Label = "Help", Href = "/dashboard/help", SortOrder = 10 }
+            new NavItem { NavItemId = 10, Code = "help", Label = "Help", Href = "/dashboard/help", SortOrder = 10 },
+            new NavItem { NavItemId = 11, Code = "ledgers", Label = "Ledgers", Href = "/dashboard/ledgers", SortOrder = 11 },
+            new NavItem { NavItemId = 12, Code = "accounts", Label = "Accounts", Href = "/dashboard/accounts", SortOrder = 12 },
+            new NavItem { NavItemId = 13, Code = "sales", Label = "Sales", Href = "/dashboard/sales", SortOrder = 13 }
         );
     }
 }

Backend/ERPCore/Infra/Persistence/Configurations/PermissionConfiguration.cs

@@ -42,10 +42,26 @@ public sealed class PermissionConfiguration : IEntityTypeConfiguration<Permissio
             new Permission { PermissionId = 16, Code = "NAV:products.configuration", SubNavItemId = 6 },
             new Permission { PermissionId = 17, Code = "NAV:settings.roles", SubNavItemId = 7 },
             new Permission { PermissionId = 18, Code = "NAV:settings.users", SubNavItemId = 8 },
-            new Permission { PermissionId = 19, Code = "NAV:procurement.requisitions", SubNavItemId = 9 },
-            new Permission { PermissionId = 20, Code = "NAV:procurement.rfqs", SubNavItemId = 10 },
-            new Permission { PermissionId = 21, Code = "NAV:procurement.purchase-orders", SubNavItemId = 11 },
-            new Permission { PermissionId = 22, Code = "NAV:procurement.purchase-returns", SubNavItemId = 12 }
+            // IDs 28-31 (not 19-22): 19-22 were already claimed by the Ledgers permissions below;
+            // these procurement rows were never actually migrated into the database before now.
+            new Permission { PermissionId = 28, Code = "NAV:procurement.requisitions", SubNavItemId = 17 },
+            new Permission { PermissionId = 29, Code = "NAV:procurement.rfqs", SubNavItemId = 18 },
+            new Permission { PermissionId = 30, Code = "NAV:procurement.purchase-orders", SubNavItemId = 19 },
+            new Permission { PermissionId = 31, Code = "NAV:procurement.purchase-returns", SubNavItemId = 20 },
+            new Permission { PermissionId = 19, Code = "NAV:ledgers", NavItemId = 11 },
+            new Permission { PermissionId = 20, Code = "NAV:ledgers.trial-balance", SubNavItemId = 9 },
+            new Permission { PermissionId = 21, Code = "NAV:ledgers.balance-sheet", SubNavItemId = 10 },
+            new Permission { PermissionId = 22, Code = "NAV:ledgers.general-ledger", SubNavItemId = 11 },
+            new Permission { PermissionId = 23, Code = "NAV:ledgers.profit-and-loss", SubNavItemId = 12 },
+            new Permission { PermissionId = 24, Code = "NAV:ledgers.cash-flow", SubNavItemId = 13 },
+            new Permission { PermissionId = 25, Code = "NAV:ledgers.budget-vs-actual", SubNavItemId = 14 },
+            new Permission { PermissionId = 27, Code = "NAV:ledgers.tax-report", SubNavItemId = 16 },
+            // Moved under the new Accounts nav item (2026-07-31) — same PermissionId (26), just a
+            // renamed Code, so any role already granted this permission keeps it.
+            new Permission { PermissionId = 26, Code = "NAV:accounts.bank-accounts", SubNavItemId = 15 },
+            new Permission { PermissionId = 32, Code = "NAV:accounts", NavItemId = 12 },
+            new Permission { PermissionId = 33, Code = "NAV:accounts.cheque-books", SubNavItemId = 21 },
+            new Permission { PermissionId = 34, Code = "NAV:accounts.received-cheques", SubNavItemId = 22 }
         );
     }
 }

Backend/ERPCore/Infra/Persistence/Configurations/ProductionConfiguration.cs

@@ -0,0 +1,277 @@
+using ERPCore.Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+// Manufacturing / Production Lines (docs/30 Part C). All eleven tables live in this one
+// file, following the StockConfiguration.cs precedent of grouping an aggregate's
+// configurations together.
+//
+// Cascade shape (deliberate): the two aggregate roots cascade to their own children —
+// template → stages/edges → inputs/outputs, run → stages/edges/events → inputs/outputs.
+// Every *cross* reference is Restrict, because making them cascade would give EF two
+// delete paths to the same table and the model validator rejects that. The consequence
+// is an ordering rule for the service layer: when replacing a graph, delete edges before
+// stages and inputs before outputs.
+
+public sealed class ProductionTemplateConfiguration : IEntityTypeConfiguration<ProductionTemplate>
+{
+    public void Configure(EntityTypeBuilder<ProductionTemplate> builder)
+    {
+        builder.ToTable("production_templates");
+        builder.HasKey(t => t.TemplateId);
+
+        builder.Property(t => t.Code).IsRequired().HasMaxLength(30);
+        builder.HasIndex(t => t.Code).IsUnique();
+
+        builder.Property(t => t.Name).IsRequired().HasMaxLength(150);
+        builder.Property(t => t.Description).HasMaxLength(500);
+
+        builder.Property(t => t.Status).HasConversion<string>().HasMaxLength(20).IsRequired();
+
+        // Same jsonb-as-string mapping as TemplateStage.FieldDefs and AuditLog.ChangeSet: a
+        // typed/owned mapping would make AuditScribe emit audit rows for the nested entries.
+        builder.Property(t => t.Annotations).HasColumnType("jsonb");
+
+        builder.Property(t => t.CreatedAt).IsRequired();
+
+        // PostgreSQL xmin system column as the optimistic concurrency token (ETag).
+        builder.Property(t => t.RowVersion).IsRowVersion();
+
+        builder.HasOne(t => t.Creator).WithMany().HasForeignKey(t => t.CreatedBy).OnDelete(DeleteBehavior.Restrict);
+
+        builder.HasIndex(t => t.Status);
+    }
+}
+
+public sealed class TemplateStageConfiguration : IEntityTypeConfiguration<TemplateStage>
+{
+    public void Configure(EntityTypeBuilder<TemplateStage> builder)
+    {
+        builder.ToTable("template_stages");
+        builder.HasKey(s => s.StageId);
+
+        builder.Property(s => s.Name).IsRequired().HasMaxLength(150);
+        builder.Property(s => s.RoleLabel).HasMaxLength(60);
+        builder.Property(s => s.PosX).HasPrecision(18, 4);
+        builder.Property(s => s.PosY).HasPrecision(18, 4);
+        builder.Property(s => s.FieldDefs).IsRequired().HasColumnType("jsonb");
+
+        builder.HasOne(s => s.Template).WithMany(t => t.Stages)
+            .HasForeignKey(s => s.TemplateId).OnDelete(DeleteBehavior.Cascade);
+    }
+}
+
+public sealed class StageEdgeConfiguration : IEntityTypeConfiguration<StageEdge>
+{
+    public void Configure(EntityTypeBuilder<StageEdge> builder)
+    {
+        builder.ToTable("stage_edges");
+        builder.HasKey(e => e.EdgeId);
+
+        builder.HasOne(e => e.Template).WithMany(t => t.Edges)
+            .HasForeignKey(e => e.TemplateId).OnDelete(DeleteBehavior.Cascade);
+
+        builder.HasOne(e => e.ParentStage).WithMany()
+            .HasForeignKey(e => e.ParentStageId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(e => e.ChildStage).WithMany()
+            .HasForeignKey(e => e.ChildStageId).OnDelete(DeleteBehavior.Restrict);
+
+        // One arrow per ordered pair; self-loops and cycles are rejected by the validator.
+        builder.HasIndex(e => new { e.ParentStageId, e.ChildStageId }).IsUnique();
+    }
+}
+
+public sealed class StageInputConfiguration : IEntityTypeConfiguration<StageInput>
+{
+    public void Configure(EntityTypeBuilder<StageInput> builder)
+    {
+        builder.ToTable("stage_inputs");
+        builder.HasKey(i => i.InputId);
+
+        builder.Property(i => i.Source).HasConversion<string>().HasMaxLength(20).IsRequired();
+        builder.Property(i => i.QtyPerBatch).HasPrecision(18, 4);
+
+        builder.HasOne(i => i.Stage).WithMany(s => s.Inputs)
+            .HasForeignKey(i => i.StageId).OnDelete(DeleteBehavior.Cascade);
+
+        builder.HasOne(i => i.Item).WithMany().HasForeignKey(i => i.ItemId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(i => i.Uom).WithMany().HasForeignKey(i => i.UomId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(i => i.FromOutput).WithMany()
+            .HasForeignKey(i => i.FromOutputId).OnDelete(DeleteBehavior.Restrict);
+    }
+}
+
+public sealed class StageOutputConfiguration : IEntityTypeConfiguration<StageOutput>
+{
+    public void Configure(EntityTypeBuilder<StageOutput> builder)
+    {
+        builder.ToTable("stage_outputs");
+        builder.HasKey(o => o.OutputId);
+
+        builder.Property(o => o.Name).IsRequired().HasMaxLength(150);
+        builder.Property(o => o.QtyPerBatch).HasPrecision(18, 4);
+
+        builder.HasOne(o => o.Stage).WithMany(s => s.Outputs)
+            .HasForeignKey(o => o.StageId).OnDelete(DeleteBehavior.Cascade);
+
+        builder.HasOne(o => o.Item).WithMany().HasForeignKey(o => o.ItemId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(o => o.Uom).WithMany().HasForeignKey(o => o.UomId).OnDelete(DeleteBehavior.Restrict);
+    }
+}
+
+public sealed class ProductionRunConfiguration : IEntityTypeConfiguration<ProductionRun>
+{
+    public void Configure(EntityTypeBuilder<ProductionRun> builder)
+    {
+        builder.ToTable("production_runs");
+        builder.HasKey(r => r.RunId);
+
+        builder.Property(r => r.DocNo).IsRequired().HasMaxLength(30);
+        builder.HasIndex(r => r.DocNo).IsUnique();
+
+        builder.Property(r => r.TargetQty).HasPrecision(18, 4);
+        builder.Property(r => r.ScaleFactor).HasPrecision(18, 6);
+        builder.Property(r => r.Status).HasConversion<string>().HasMaxLength(20).IsRequired();
+        builder.Property(r => r.CreatedAt).IsRequired();
+        builder.Property(r => r.RowVersion).IsRowVersion();
+
+        builder.HasOne(r => r.Template).WithMany(t => t.Runs)
+            .HasForeignKey(r => r.TemplateId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(r => r.Warehouse).WithMany().HasForeignKey(r => r.WarehouseId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(r => r.OutputBin).WithMany().HasForeignKey(r => r.OutputBinId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(r => r.CancelReason).WithMany().HasForeignKey(r => r.CancelReasonCodeId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(r => r.Creator).WithMany().HasForeignKey(r => r.CreatedBy).OnDelete(DeleteBehavior.Restrict);
+
+        // Run board filters (docs/30 §D.2) and the template edit-lock count (FR-MFG-06).
+        builder.HasIndex(r => r.Status);
+        builder.HasIndex(r => new { r.TemplateId, r.Status });
+    }
+}
+
+public sealed class RunStageConfiguration : IEntityTypeConfiguration<RunStage>
+{
+    public void Configure(EntityTypeBuilder<RunStage> builder)
+    {
+        builder.ToTable("run_stages");
+        builder.HasKey(s => s.RunStageId);
+
+        builder.Property(s => s.Name).IsRequired().HasMaxLength(150);
+        builder.Property(s => s.RoleLabel).HasMaxLength(60);
+        builder.Property(s => s.PosX).HasPrecision(18, 4);
+        builder.Property(s => s.PosY).HasPrecision(18, 4);
+        builder.Property(s => s.Status).HasConversion<string>().HasMaxLength(20).IsRequired();
+        builder.Property(s => s.FieldDefs).IsRequired().HasColumnType("jsonb");
+        builder.Property(s => s.FieldValues).HasColumnType("jsonb");
+        builder.Property(s => s.RowVersion).IsRowVersion();
+
+        builder.HasOne(s => s.Run).WithMany(r => r.Stages)
+            .HasForeignKey(s => s.RunId).OnDelete(DeleteBehavior.Cascade);
+
+        // SetNull, not Restrict: a template edit may delete a stage that completed or
+        // cancelled runs still point at. Everything needed to render such a run is copied
+        // onto this row, so losing the provenance link is the intended trade (FR-MFG-06).
+        builder.HasOne(s => s.TemplateStage).WithMany()
+            .HasForeignKey(s => s.TemplateStageId).OnDelete(DeleteBehavior.SetNull);
+
+        builder.HasIndex(s => new { s.RunId, s.Status });
+    }
+}
+
+public sealed class RunEdgeConfiguration : IEntityTypeConfiguration<RunEdge>
+{
+    public void Configure(EntityTypeBuilder<RunEdge> builder)
+    {
+        builder.ToTable("run_edges");
+        builder.HasKey(e => e.RunEdgeId);
+
+        builder.HasOne(e => e.Run).WithMany(r => r.Edges)
+            .HasForeignKey(e => e.RunId).OnDelete(DeleteBehavior.Cascade);
+
+        builder.HasOne(e => e.ParentRunStage).WithMany()
+            .HasForeignKey(e => e.ParentRunStageId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(e => e.ChildRunStage).WithMany()
+            .HasForeignKey(e => e.ChildRunStageId).OnDelete(DeleteBehavior.Restrict);
+
+        builder.HasIndex(e => new { e.ParentRunStageId, e.ChildRunStageId }).IsUnique();
+    }
+}
+
+public sealed class RunStageInputConfiguration : IEntityTypeConfiguration<RunStageInput>
+{
+    public void Configure(EntityTypeBuilder<RunStageInput> builder)
+    {
+        builder.ToTable("run_stage_inputs");
+        builder.HasKey(i => i.RunInputId);
+
+        builder.Property(i => i.Source).HasConversion<string>().HasMaxLength(20).IsRequired();
+        builder.Property(i => i.PlannedQty).HasPrecision(18, 4);
+        builder.Property(i => i.ConsumedQty).HasPrecision(18, 4);
+        builder.Property(i => i.ConsumedValue).HasPrecision(18, 4);
+        builder.Property(i => i.DeliveredQty).HasPrecision(18, 4);
+        builder.Property(i => i.ReturnedQty).HasPrecision(18, 4);
+        builder.Property(i => i.ReturnedValue).HasPrecision(18, 4);
+
+        builder.HasOne(i => i.RunStage).WithMany(s => s.Inputs)
+            .HasForeignKey(i => i.RunStageId).OnDelete(DeleteBehavior.Cascade);
+
+        builder.HasOne(i => i.Item).WithMany().HasForeignKey(i => i.ItemId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(i => i.Uom).WithMany().HasForeignKey(i => i.UomId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(i => i.FromRunOutput).WithMany()
+            .HasForeignKey(i => i.FromRunOutputId).OnDelete(DeleteBehavior.Restrict);
+
+        // Transfers route by the source output, so this is the hot lookup.
+        builder.HasIndex(i => i.FromRunOutputId);
+    }
+}
+
+public sealed class RunStageOutputConfiguration : IEntityTypeConfiguration<RunStageOutput>
+{
+    public void Configure(EntityTypeBuilder<RunStageOutput> builder)
+    {
+        builder.ToTable("run_stage_outputs");
+        builder.HasKey(o => o.RunOutputId);
+
+        builder.Property(o => o.Name).IsRequired().HasMaxLength(150);
+        builder.Property(o => o.PlannedQty).HasPrecision(18, 4);
+        builder.Property(o => o.ProducedQty).HasPrecision(18, 4);
+        builder.Property(o => o.ScrappedQty).HasPrecision(18, 4);
+        builder.Property(o => o.TransferredQty).HasPrecision(18, 4);
+
+        builder.HasOne(o => o.RunStage).WithMany(s => s.Outputs)
+            .HasForeignKey(o => o.RunStageId).OnDelete(DeleteBehavior.Cascade);
+
+        builder.HasOne(o => o.Item).WithMany().HasForeignKey(o => o.ItemId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(o => o.Uom).WithMany().HasForeignKey(o => o.UomId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(o => o.ScrapReason).WithMany().HasForeignKey(o => o.ScrapReasonCodeId).OnDelete(DeleteBehavior.Restrict);
+    }
+}
+
+public sealed class RunStageEventConfiguration : IEntityTypeConfiguration<RunStageEvent>
+{
+    public void Configure(EntityTypeBuilder<RunStageEvent> builder)
+    {
+        // Append-only history: the app never updates or deletes these rows.
+        builder.ToTable("run_stage_events");
+        builder.HasKey(e => e.EventId);
+
+        builder.Property(e => e.EventType).HasConversion<string>().HasMaxLength(20).IsRequired();
+        builder.Property(e => e.Note).HasMaxLength(500);
+        builder.Property(e => e.Payload).HasColumnType("jsonb");
+        builder.Property(e => e.CreatedAt).IsRequired();
+
+        builder.HasOne(e => e.Run).WithMany(r => r.Events)
+            .HasForeignKey(e => e.RunId).OnDelete(DeleteBehavior.Cascade);
+
+        // SetNull rather than Cascade: the run-level cascade above already removes these
+        // rows, and a second cascade path (run → stage → event) is what EF rejects.
+        builder.HasOne(e => e.RunStage).WithMany(s => s.Events)
+            .HasForeignKey(e => e.RunStageId).OnDelete(DeleteBehavior.SetNull);
+
+        builder.HasOne(e => e.User).WithMany().HasForeignKey(e => e.UserId).OnDelete(DeleteBehavior.Restrict);
+
+        // The run-detail timeline reads the whole run's history in one ordered pass.
+        builder.HasIndex(e => new { e.RunId, e.EventId });
+    }
+}

Backend/ERPCore/Infra/Persistence/Configurations/PurchaseOrderConfiguration.cs

@@ -49,6 +49,9 @@ public sealed class PoLineConfiguration : IEntityTypeConfiguration<PoLine>
         builder.HasKey(l => l.PoLineId);
 
         builder.Property(l => l.Qty).HasPrecision(18, 4);
+        builder.Property(l => l.QtyBase).HasPrecision(18, 4);
+        builder.Property(l => l.QtyReceivedBase).HasPrecision(18, 4);
+        builder.Property(l => l.ConversionFactor).HasPrecision(18, 6).HasDefaultValue(1m);
         builder.Property(l => l.UnitPrice).HasPrecision(18, 4);
         builder.Property(l => l.Tax).HasPrecision(9, 4);
         builder.Property(l => l.QtyReceived).HasPrecision(18, 4);

Backend/ERPCore/Infra/Persistence/Configurations/SalesInvoiceConfiguration.cs

@@ -0,0 +1,98 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+public sealed class SalesInvoiceConfiguration : IEntityTypeConfiguration<SalesInvoice>
+{
+    public void Configure(EntityTypeBuilder<SalesInvoice> builder)
+    {
+        builder.ToTable("sales_invoices");
+        builder.HasKey(x => x.SalesInvoiceId);
+
+        builder.Property(x => x.InvoiceNo).IsRequired().HasMaxLength(50);
+        builder.HasIndex(x => x.InvoiceNo).IsUnique();
+
+        builder.Property(x => x.InvoiceDate).IsRequired();
+
+        builder.HasOne(x => x.Customer)
+            .WithMany()
+            .HasForeignKey(x => x.CustomerId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.Property(x => x.CustomerSnapshotName).IsRequired().HasMaxLength(200);
+        builder.Property(x => x.CustomerSnapshotTaxNo).HasMaxLength(50);
+
+        builder.HasOne(x => x.Warehouse)
+            .WithMany()
+            .HasForeignKey(x => x.WarehouseId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.Property(x => x.InvoiceType)
+            .HasConversion<string>().HasMaxLength(20).IsRequired()
+            .HasDefaultValue(SalesInvoiceType.B2C);
+
+        builder.Property(x => x.Status)
+            .HasConversion<string>().HasMaxLength(20).IsRequired()
+            .HasDefaultValue(SalesInvoiceStatus.Draft);
+
+        foreach (var p in new[] { nameof(SalesInvoice.Subtotal), nameof(SalesInvoice.DiscountTotal), nameof(SalesInvoice.TaxTotal), nameof(SalesInvoice.GrandTotal), nameof(SalesInvoice.RoundOff), nameof(SalesInvoice.NetPayable), nameof(SalesInvoice.PaidAmount), nameof(SalesInvoice.BalanceAmount) })
+            builder.Property<decimal>(p).HasPrecision(18, 4);
+
+        builder.Property(x => x.CreatedAt).IsRequired();
+        builder.Property(x => x.RowVersion).IsRowVersion();
+
+        builder.HasIndex(x => x.Status);
+        builder.HasIndex(x => x.InvoiceDate);
+
+        builder.HasMany(x => x.Lines)
+            .WithOne(x => x.SalesInvoice)
+            .HasForeignKey(x => x.SalesInvoiceId)
+            .OnDelete(DeleteBehavior.Cascade);
+    }
+}
+
+public sealed class SalesInvoiceLineConfiguration : IEntityTypeConfiguration<SalesInvoiceLine>
+{
+    public void Configure(EntityTypeBuilder<SalesInvoiceLine> builder)
+    {
+        builder.ToTable("sales_invoice_lines");
+        builder.HasKey(x => x.SalesInvoiceLineId);
+
+        builder.HasOne(x => x.Item)
+            .WithMany()
+            .HasForeignKey(x => x.ItemId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.Property(x => x.Description).IsRequired().HasMaxLength(200);
+
+        builder.Property(x => x.Qty).HasPrecision(18, 4);
+        builder.Property(x => x.FreeQty).HasPrecision(18, 4);
+        builder.Property(x => x.QtyBase).HasPrecision(18, 4);
+        builder.Property(x => x.FreeQtyBase).HasPrecision(18, 4);
+        builder.Property(x => x.ConversionFactor).HasPrecision(18, 6).HasDefaultValue(1m);
+        builder.Property(x => x.UnitPrice).HasPrecision(18, 4);
+        builder.Property(x => x.BaseCost).HasPrecision(18, 4);
+        builder.Property(x => x.DiscountPct).HasPrecision(9, 4);
+        builder.Property(x => x.DiscountAmount).HasPrecision(18, 4);
+        builder.Property(x => x.NetUnitPrice).HasPrecision(18, 4);
+        builder.Property(x => x.LineTotal).HasPrecision(18, 4);
+        builder.Property(x => x.TaxPct).HasPrecision(9, 4);
+        builder.Property(x => x.TaxAmount).HasPrecision(18, 4);
+
+        builder.HasOne(x => x.Uom)
+            .WithMany()
+            .HasForeignKey(x => x.UomId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.HasOne(x => x.Warehouse)
+            .WithMany()
+            .HasForeignKey(x => x.WarehouseId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.Property(x => x.PriceSource).HasMaxLength(50);
+        builder.Property(x => x.RowVersion).IsRowVersion();
+    }
+}

Backend/ERPCore/Infra/Persistence/Configurations/SalesSlipConfiguration.cs

@@ -0,0 +1,98 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+public sealed class SalesSlipConfiguration : IEntityTypeConfiguration<SalesSlip>
+{
+    public void Configure(EntityTypeBuilder<SalesSlip> builder)
+    {
+        builder.ToTable("sales_slips");
+        builder.HasKey(x => x.SalesSlipId);
+
+        builder.Property(x => x.SlipNo).IsRequired().HasMaxLength(50);
+        builder.HasIndex(x => x.SlipNo).IsUnique();
+
+        builder.Property(x => x.SlipDate).IsRequired();
+
+        builder.HasOne(x => x.Customer)
+            .WithMany()
+            .HasForeignKey(x => x.CustomerId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.Property(x => x.CustomerSnapshotName).IsRequired().HasMaxLength(200);
+
+        builder.HasOne(x => x.Warehouse)
+            .WithMany()
+            .HasForeignKey(x => x.WarehouseId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.HasOne(x => x.CashierUser)
+            .WithMany()
+            .HasForeignKey(x => x.CashierUserId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.Property(x => x.Status)
+            .HasConversion<string>().HasMaxLength(20).IsRequired()
+            .HasDefaultValue(SalesSlipStatus.Draft);
+
+        foreach (var p in new[] { nameof(SalesSlip.Subtotal), nameof(SalesSlip.DiscountTotal), nameof(SalesSlip.TaxTotal), nameof(SalesSlip.GrandTotal), nameof(SalesSlip.PaidAmount), nameof(SalesSlip.BalanceAmount) })
+            builder.Property<decimal>(p).HasPrecision(18, 4);
+
+        builder.Property(x => x.CreatedAt).IsRequired();
+        builder.Property(x => x.RowVersion).IsRowVersion();
+
+        builder.HasIndex(x => x.Status);
+        builder.HasIndex(x => x.SlipDate);
+
+        builder.HasMany(x => x.Lines)
+            .WithOne(x => x.SalesSlip)
+            .HasForeignKey(x => x.SalesSlipId)
+            .OnDelete(DeleteBehavior.Cascade);
+    }
+}
+
+public sealed class SalesSlipLineConfiguration : IEntityTypeConfiguration<SalesSlipLine>
+{
+    public void Configure(EntityTypeBuilder<SalesSlipLine> builder)
+    {
+        builder.ToTable("sales_slip_lines");
+        builder.HasKey(x => x.SalesSlipLineId);
+
+        builder.HasOne(x => x.Item)
+            .WithMany()
+            .HasForeignKey(x => x.ItemId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.Property(x => x.Description).IsRequired().HasMaxLength(200);
+
+        builder.Property(x => x.Qty).HasPrecision(18, 4);
+        builder.Property(x => x.FreeQty).HasPrecision(18, 4);
+        builder.Property(x => x.QtyBase).HasPrecision(18, 4);
+        builder.Property(x => x.FreeQtyBase).HasPrecision(18, 4);
+        builder.Property(x => x.ConversionFactor).HasPrecision(18, 6).HasDefaultValue(1m);
+        builder.Property(x => x.UnitPrice).HasPrecision(18, 4);
+        builder.Property(x => x.BaseCost).HasPrecision(18, 4);
+        builder.Property(x => x.DiscountPct).HasPrecision(9, 4);
+        builder.Property(x => x.DiscountAmount).HasPrecision(18, 4);
+        builder.Property(x => x.NetUnitPrice).HasPrecision(18, 4);
+        builder.Property(x => x.LineTotal).HasPrecision(18, 4);
+        builder.Property(x => x.TaxPct).HasPrecision(9, 4);
+        builder.Property(x => x.TaxAmount).HasPrecision(18, 4);
+
+        builder.HasOne(x => x.Uom)
+            .WithMany()
+            .HasForeignKey(x => x.UomId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.HasOne(x => x.Warehouse)
+            .WithMany()
+            .HasForeignKey(x => x.WarehouseId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.Property(x => x.PriceSource).HasMaxLength(50);
+        builder.Property(x => x.RowVersion).IsRowVersion();
+    }
+}

Backend/ERPCore/Infra/Persistence/Configurations/SubNavItemConfiguration.cs

@@ -33,11 +33,27 @@ public sealed class SubNavItemConfiguration : IEntityTypeConfiguration<SubNavIte
             new SubNavItem { SubNavItemId = 6, NavItemId = 2, Code = "products.configuration", Label = "Configuration", Href = "/dashboard/products/settings", SortOrder = 6 },
             new SubNavItem { SubNavItemId = 7, NavItemId = 9, Code = "settings.roles", Label = "Roles", Href = "/dashboard/settings/roles", SortOrder = 1 },
             new SubNavItem { SubNavItemId = 8, NavItemId = 9, Code = "settings.users", Label = "Users", Href = "/dashboard/settings/users", SortOrder = 2 },
+            new SubNavItem { SubNavItemId = 23, NavItemId = 13, Code = "sales.bundle-sales", Label = "Bundle Sales", Href = "/dashboard/sales/bundles", SortOrder = 1 },
             // Procurement (NavItemId 4) children — mirror the hub page order.
-            new SubNavItem { SubNavItemId = 9, NavItemId = 4, Code = "procurement.requisitions", Label = "Requisitions", Href = "/dashboard/procurement/requisitions", SortOrder = 1 },
-            new SubNavItem { SubNavItemId = 10, NavItemId = 4, Code = "procurement.rfqs", Label = "RFQs", Href = "/dashboard/procurement/rfqs", SortOrder = 2 },
-            new SubNavItem { SubNavItemId = 11, NavItemId = 4, Code = "procurement.purchase-orders", Label = "Purchase Orders", Href = "/dashboard/procurement/purchase-orders", SortOrder = 3 },
-            new SubNavItem { SubNavItemId = 12, NavItemId = 4, Code = "procurement.purchase-returns", Label = "Purchase Returns", Href = "/dashboard/procurement/purchase-returns", SortOrder = 4 }
+            // IDs 17-20 (not 9-12): 9-12 were already claimed by the Ledgers sub-items below;
+            // these procurement rows were never actually migrated into the database before now.
+            new SubNavItem { SubNavItemId = 17, NavItemId = 4, Code = "procurement.requisitions", Label = "Requisitions", Href = "/dashboard/procurement/requisitions", SortOrder = 1 },
+            new SubNavItem { SubNavItemId = 18, NavItemId = 4, Code = "procurement.rfqs", Label = "RFQs", Href = "/dashboard/procurement/rfqs", SortOrder = 2 },
+            new SubNavItem { SubNavItemId = 19, NavItemId = 4, Code = "procurement.purchase-orders", Label = "Purchase Orders", Href = "/dashboard/procurement/purchase-orders", SortOrder = 3 },
+            new SubNavItem { SubNavItemId = 20, NavItemId = 4, Code = "procurement.purchase-returns", Label = "Purchase Returns", Href = "/dashboard/procurement/purchase-returns", SortOrder = 4 },
+            new SubNavItem { SubNavItemId = 9, NavItemId = 11, Code = "ledgers.trial-balance", Label = "Trial Balance", Href = "/dashboard/ledgers/trial-balance", SortOrder = 1 },
+            new SubNavItem { SubNavItemId = 10, NavItemId = 11, Code = "ledgers.balance-sheet", Label = "Balance Sheet", Href = "/dashboard/ledgers/balance-sheet", SortOrder = 2 },
+            new SubNavItem { SubNavItemId = 11, NavItemId = 11, Code = "ledgers.general-ledger", Label = "General Ledger", Href = "/dashboard/ledgers/general-ledger", SortOrder = 3 },
+            new SubNavItem { SubNavItemId = 12, NavItemId = 11, Code = "ledgers.profit-and-loss", Label = "Profit & Loss", Href = "/dashboard/ledgers/profit-and-loss", SortOrder = 4 },
+            new SubNavItem { SubNavItemId = 13, NavItemId = 11, Code = "ledgers.cash-flow", Label = "Cash Flow", Href = "/dashboard/ledgers/cash-flow", SortOrder = 5 },
+            new SubNavItem { SubNavItemId = 14, NavItemId = 11, Code = "ledgers.budget-vs-actual", Label = "Budget vs Actual", Href = "/dashboard/ledgers/budget-vs-actual", SortOrder = 6 },
+            new SubNavItem { SubNavItemId = 16, NavItemId = 11, Code = "ledgers.tax-report", Label = "Tax Report", Href = "/dashboard/ledgers/tax-report", SortOrder = 7 },
+            // Moved under the new Accounts nav item (2026-07-31) — kept the same SubNavItemId (15)
+            // rather than delete+recreate, so any role that already had this permission granted
+            // doesn't silently lose it just because the section it lives under changed.
+            new SubNavItem { SubNavItemId = 15, NavItemId = 12, Code = "accounts.bank-accounts", Label = "Cash / Bank Accounts", Href = "/dashboard/accounts/bank-accounts", SortOrder = 1 },
+            new SubNavItem { SubNavItemId = 21, NavItemId = 12, Code = "accounts.cheque-books", Label = "Cheque Books", Href = "/dashboard/accounts/cheque-books", SortOrder = 2 },
+            new SubNavItem { SubNavItemId = 22, NavItemId = 12, Code = "accounts.received-cheques", Label = "Received Cheques", Href = "/dashboard/accounts/received-cheques", SortOrder = 3 }
         );
     }
 }

Backend/ERPCore/Infra/Persistence/Configurations/UomConversionConfiguration.cs

@@ -30,5 +30,9 @@ public sealed class UomConversionConfiguration : IEntityTypeConfiguration<UomCon
 
         // One conversion per (item, from, to) triple.
         builder.HasIndex(c => new { c.ItemId, c.FromUomId, c.ToUomId }).IsUnique();
+
+        // The API guards this too, but UomConverter divides unit cost by the factor — a zero
+        // reaching the table from a seeder or direct SQL would be a divide-by-zero at post time.
+        builder.ToTable(t => t.HasCheckConstraint("ck_uom_conversions_factor_positive", "\"Factor\" > 0"));
     }
 }

Backend/ERPCore/Infra/Persistence/DataSeeder.cs

@@ -1,4 +1,5 @@
 using ERPCore.Domain.Entities;
+using ERPCore.Domain;
 using ERPCore.Domain.Enums;
 using Microsoft.EntityFrameworkCore;
 
@@ -30,13 +31,23 @@ public static class DataSeeder
         ("WRONG", "Wrong Item", ReasonContext.Return),
         ("OVER", "Over-supply", ReasonContext.Return),
         ("QREJ", "Quality Reject", ReasonContext.Return),
+        // Manufacturing (docs/30 §A.2) — scrap at stage complete, leftover return before
+        // receipt, and the mandatory reason on a run cancel.
+        ("PRD-SCRAP", "Production Scrap", ReasonContext.Production),
+        ("PRD-LEFTOVER", "Production Leftover Return", ReasonContext.Production),
+        ("PRD-CANCEL", "Production Run Cancelled", ReasonContext.Production),
+        ("PRD-REWORK-LOSS", "Production Rework Loss", ReasonContext.Production),
     ];
 
     public static async Task SeedAsync(ErpDbContext db, CancellationToken ct = default)
     {
         var dirty = await SeedReasonCodesAsync(db, ct);
         dirty |= await SeedItemTypesAsync(db, ct);
+       // dirty |= await SeedCompanyProfileAsync(db, ct);
         dirty |= await SeedProductConfigAsync(db, ct);
+        dirty |= await SeedSalesMastersAsync(db, ct);
+        dirty |= await SeedSalesStockAsync(db, ct);
+        dirty |= await SeedSalesAsync(db, ct);
 
         if (dirty) await db.SaveChangesAsync(ct);
     }
@@ -93,4 +104,754 @@ public static class DataSeeder
         });
         return true;
     }
+
+    /// <summary>
+    /// Seeds a printable company profile with reasonable defaults for invoice headers.
+    /// These values are intentionally editable later through the API.
+    /// </summary>
+    //private static async Task<bool> SeedCompanyProfileAsync(ErpDbContext db, CancellationToken ct)
+    //{
+    //    if (await db.CompanyProfiles.AnyAsync(c => c.CompanyProfileId == CompanyProfile.SingletonId, ct)) return false;
+
+    //    db.CompanyProfiles.Add(new CompanyProfile
+    //    {
+    //        CompanyProfileId = CompanyProfile.SingletonId,
+    //        LegalName = "ERP Core Trading (Pvt) Ltd",
+    //        TradeName = "ERP Core Trading",
+    //        TaxRegistrationNo = "TAX-DEFAULT-001",
+    //        VatRegistrationNo = "VAT-DEFAULT-001",
+    //        AddressLine1 = "1 Demo Street",
+    //        City = "Colombo",
+    //        Country = "Sri Lanka",
+    //        Phone = "+94 11 000 0000",
+    //        Email = "accounts@example.com",
+    //        BankName = "Demo Bank",
+    //        BankBranch = "Colombo Main",
+    //        AccountName = "ERP Core Trading (Pvt) Ltd",
+    //        AccountNumber = "000123456789",
+    //        SwiftCode = "DEMO1234",
+    //        FooterNote = "Thank you for your business."
+    //    });
+    //    return true;
+    //}
+
+    /// <summary>
+    /// Seeds the minimum catalog data required for the sales demo rows to exist.
+    /// These are safe additive rows and do not alter any existing data.
+    /// </summary>
+    private static async Task<bool> SeedSalesMastersAsync(ErpDbContext db, CancellationToken ct)
+    {
+        var dirty = false;
+
+        dirty |= await SeedWarehousesAsync(db, ct);
+        dirty |= await SeedUomsAsync(db, ct);
+        dirty |= await SeedCategoriesAsync(db, ct);
+        dirty |= await SeedItemsAsync(db, ct);
+
+        return dirty;
+    }
+
+    /// <summary>
+    /// Seeds a simple on-hand FIFO layer for the demo sales item so the sample
+    /// invoices can be posted without immediately failing stock validation.
+    /// This keeps the stock-check and posting flows testable on a fresh database.
+    /// </summary>
+    private static async Task<bool> SeedSalesStockAsync(ErpDbContext db, CancellationToken ct)
+    {
+        var warehouse = await db.Warehouses.AsNoTracking()
+            .OrderBy(w => w.WarehouseId)
+            .FirstOrDefaultAsync(ct);
+        var item = await db.Items.AsNoTracking()
+            .OrderBy(i => i.ItemId)
+            .FirstOrDefaultAsync(ct);
+        var secondItem = await db.Items.AsNoTracking()
+            .OrderByDescending(i => i.ItemId)
+            .FirstOrDefaultAsync(ct);
+
+        if (warehouse is null || item is null || secondItem is null)
+            return false;
+
+        var existing = await db.StockLayers.AnyAsync(
+            l => (l.ItemId == item.ItemId || l.ItemId == secondItem.ItemId) && l.WarehouseId == warehouse.WarehouseId && l.QtyRemaining > 0m,
+            ct);
+        if (existing) return false;
+
+        db.StockLayers.Add(new StockLayer
+        {
+            ItemId = item.ItemId,
+            WarehouseId = warehouse.WarehouseId,
+            QtyReceived = 100m,
+            QtyRemaining = 100m,
+            UnitCost = item.SalePrice.GetValueOrDefault() > 0m ? item.SalePrice.GetValueOrDefault() / 2m : 25m,
+            ReceiptDate = DateTime.UtcNow.AddDays(-7)
+        });
+        db.StockLayers.Add(new StockLayer
+        {
+            ItemId = secondItem.ItemId,
+            WarehouseId = warehouse.WarehouseId,
+            QtyReceived = 5m,
+            QtyRemaining = 5m,
+            UnitCost = secondItem.SalePrice.GetValueOrDefault() > 0m ? secondItem.SalePrice.GetValueOrDefault() / 2m : 15m,
+            ReceiptDate = DateTime.UtcNow.AddDays(-6)
+        });
+        return true;
+    }
+
+    private static async Task<bool> SeedWarehousesAsync(ErpDbContext db, CancellationToken ct)
+    {
+        var existingCodes = await db.Warehouses.Select(w => w.Code).ToListAsync(ct);
+        var have = existingCodes.ToHashSet(StringComparer.OrdinalIgnoreCase);
+
+        var seeds = new[]
+        {
+            new Warehouse { Code = "MAIN", Name = "Main Warehouse" },
+            new Warehouse { Code = "SHOP", Name = "Sales Counter" }
+        };
+
+        var toAdd = seeds.Where(w => !have.Contains(w.Code)).ToList();
+        if (toAdd.Count == 0) return false;
+
+        db.Warehouses.AddRange(toAdd);
+        return true;
+    }
+
+    private static async Task<bool> SeedUomsAsync(ErpDbContext db, CancellationToken ct)
+    {
+        var existingNames = await db.Uoms.Select(u => u.Name).ToListAsync(ct);
+        var have = existingNames.ToHashSet(StringComparer.OrdinalIgnoreCase);
+
+        var seeds = new[]
+        {
+            new Uom { Name = "PCS" },
+            new Uom { Name = "BOX" }
+        };
+
+        var toAdd = seeds.Where(u => !have.Contains(u.Name)).ToList();
+        if (toAdd.Count == 0) return false;
+
+        db.Uoms.AddRange(toAdd);
+        return true;
+    }
+
+    private static async Task<bool> SeedCategoriesAsync(ErpDbContext db, CancellationToken ct)
+    {
+        var existingNames = await db.Categories.Select(c => c.Name).ToListAsync(ct);
+        var have = existingNames.ToHashSet(StringComparer.OrdinalIgnoreCase);
+
+        var seeds = new[]
+        {
+            new Category { Name = "General Goods", Status = EntityStatus.Active, CreatedAt = DateTime.UtcNow },
+            new Category { Name = "Accessories", Status = EntityStatus.Active, CreatedAt = DateTime.UtcNow }
+        };
+
+        var toAdd = seeds.Where(c => !have.Contains(c.Name)).ToList();
+        if (toAdd.Count == 0) return false;
+
+        db.Categories.AddRange(toAdd);
+        return true;
+    }
+
+    private static async Task<bool> SeedItemsAsync(ErpDbContext db, CancellationToken ct)
+    {
+        var existingSkus = await db.Items.Select(i => i.Sku).ToListAsync(ct);
+        var have = existingSkus.ToHashSet(StringComparer.OrdinalIgnoreCase);
+
+        var category = await db.Categories.AsNoTracking()
+            .OrderBy(c => c.CategoryId)
+            .FirstOrDefaultAsync(ct);
+        var uom = await db.Uoms.AsNoTracking()
+            .OrderBy(u => u.UomId)
+            .FirstOrDefaultAsync(ct);
+
+        if (category is null || uom is null)
+            return false;
+
+        var now = DateTime.UtcNow;
+        var seeds = new[]
+        {
+            new Item
+            {
+                Sku = "SKU-DEMO-001",
+                Name = "Demo Item 1",
+                Description = "Seeded sample item for sales documents",
+                CategoryId = category.CategoryId,
+                BaseUomId = uom.UomId,
+                StockNature = StockNature.Stocked,
+                TrackingMode = TrackingMode.None,
+                SalePrice = 100m,
+                Status = EntityStatus.Active,
+                CreatedAt = now
+            },
+            new Item
+            {
+                Sku = "SKU-DEMO-002",
+                Name = "Demo Item 2",
+                Description = "Secondary seeded sample item for sales documents",
+                CategoryId = category.CategoryId,
+                BaseUomId = uom.UomId,
+                StockNature = StockNature.Stocked,
+                TrackingMode = TrackingMode.None,
+                SalePrice = 50m,
+                Status = EntityStatus.Active,
+                CreatedAt = now
+            }
+        };
+
+        var toAdd = seeds.Where(i => !have.Contains(i.Sku)).ToList();
+        if (toAdd.Count == 0) return false;
+
+        db.Items.AddRange(toAdd);
+        return true;
+    }
+
+    /// <summary>
+    /// Seeds the minimum sales bootstrap data needed for UI/backend development:
+    /// a couple of customer rows, current-year document counters, and a few draft
+    /// invoice/slip samples when the required master data already exists.
+    /// This intentionally never clears or rewrites any existing rows.
+    /// </summary>
+    private static async Task<bool> SeedSalesAsync(ErpDbContext db, CancellationToken ct)
+    {
+        var dirty = false;
+
+        dirty |= await SeedSalesCustomersAsync(db, ct);
+        dirty |= await SeedSalesSequencesAsync(db, ct);
+        dirty |= await SeedSampleSalesDocsAsync(db, ct);
+
+        try
+        {
+            dirty |= await SeedBundleSalesAsync(db, ct);
+        }
+        catch
+        {
+            // Bundle demo data is best-effort only; never block startup because of seed drift.
+        }
+
+        return dirty;
+    }
+
+    private static async Task<bool> SeedSalesCustomersAsync(ErpDbContext db, CancellationToken ct)
+    {
+        var existingCodes = await db.Customers.Select(c => c.CustomerCode).ToListAsync(ct);
+        var have = existingCodes.ToHashSet(StringComparer.OrdinalIgnoreCase);
+
+        var seeds = new[]
+        {
+            new Customer
+            {
+                CustomerCode = "CUST-WALKIN",
+                CustomerType = CustomerType.B2C,
+                Name = "Walk-in Customer",
+                DisplayName = "Walk-in Customer",
+                CreditLimit = 0m,
+                CreditDays = 0,
+                Status = EntityStatus.Active,
+                CreatedAt = DateTime.UtcNow
+            },
+            new Customer
+            {
+                CustomerCode = "CUST-DEMO",
+                CustomerType = CustomerType.B2B,
+                Name = "Demo Retail Ltd",
+                DisplayName = "Demo Retail Ltd",
+                Phone = "+94 11 000 0000",
+                Email = "sales@example.com",
+                AddressLine1 = "1 Demo Street",
+                City = "Colombo",
+                Country = "Sri Lanka",
+                TaxRegistrationNo = "VAT-DEMO-001",
+                CreditLimit = 250000m,
+                CreditDays = 30,
+                Status = EntityStatus.Active,
+                CreatedAt = DateTime.UtcNow
+            }
+        };
+
+        var toAdd = seeds.Where(c => !have.Contains(c.CustomerCode)).ToList();
+        if (toAdd.Count == 0) return false;
+
+        db.Customers.AddRange(toAdd);
+        return true;
+    }
+
+    private static async Task<bool> SeedSalesSequencesAsync(ErpDbContext db, CancellationToken ct)
+    {
+        var year = DateTime.UtcNow.Year;
+        var existing = await db.NumberSequences
+            .Where(s => s.Year == year && (s.DocType == DocumentTypes.SalesInvoice || s.DocType == DocumentTypes.SalesSlip || s.DocType == DocumentTypes.BundleSale))
+            .Select(s => s.DocType)
+            .ToListAsync(ct);
+        var have = existing.ToHashSet(StringComparer.OrdinalIgnoreCase);
+
+        var seeds = new[]
+        {
+            new NumberSequence { DocType = DocumentTypes.SalesInvoice, Year = year, LastNumber = 0 },
+            new NumberSequence { DocType = DocumentTypes.SalesSlip, Year = year, LastNumber = 0 },
+            new NumberSequence { DocType = DocumentTypes.BundleSale, Year = year, LastNumber = 0 }
+        };
+
+        var toAdd = seeds.Where(s => !have.Contains(s.DocType)).ToList();
+        if (toAdd.Count == 0) return false;
+
+        db.NumberSequences.AddRange(toAdd);
+        return true;
+    }
+
+    private static async Task<bool> SeedBundleSalesAsync(ErpDbContext db, CancellationToken ct)
+    {
+        if (await db.BundleSaleTemplates.AnyAsync(ct) || await db.BundleSales.AnyAsync(ct))
+            return false;
+
+        var customer = await db.Customers.AsNoTracking()
+            .OrderBy(c => c.CustomerId)
+            .FirstOrDefaultAsync(ct);
+        var warehouse = await db.Warehouses.AsNoTracking()
+            .OrderBy(w => w.WarehouseId)
+            .FirstOrDefaultAsync(ct);
+        var secondaryWarehouse = await db.Warehouses.AsNoTracking()
+            .OrderByDescending(w => w.WarehouseId)
+            .FirstOrDefaultAsync(ct);
+        var items = await db.Items.AsNoTracking()
+            .OrderBy(i => i.ItemId)
+            .Take(2)
+            .ToListAsync(ct);
+        var uom = await db.Uoms.AsNoTracking()
+            .OrderBy(u => u.UomId)
+            .FirstOrDefaultAsync(ct);
+        var user = await db.Users.AsNoTracking()
+            .OrderBy(u => u.UserId)
+            .FirstOrDefaultAsync(ct);
+
+        if (customer is null || warehouse is null || secondaryWarehouse is null || items.Count < 2 || uom is null || user is null)
+            return false;
+
+        var now = DateTime.UtcNow;
+        var template = new BundleSaleTemplate
+        {
+            TemplateCode = "BND-DEMO-001",
+            TemplateName = "Demo Bundle Pack",
+            Description = "Seeded fixed bundle template for integration testing",
+            Status = EntityStatus.Active,
+            CreatedAt = now,
+            Lines =
+            [
+                new BundleSaleTemplateLine
+                {
+                    ItemId = items[0].ItemId,
+                    UomId = uom.UomId,
+                    WarehouseId = warehouse.WarehouseId,
+                    Qty = 1m,
+                    UnitPrice = items[0].SalePrice.GetValueOrDefault(),
+                    IncludeInBundle = true,
+                    SortOrder = 1
+                },
+                new BundleSaleTemplateLine
+                {
+                    ItemId = items[1].ItemId,
+                    UomId = uom.UomId,
+                    WarehouseId = warehouse.WarehouseId,
+                    Qty = 1m,
+                    UnitPrice = items[1].SalePrice.GetValueOrDefault(),
+                    IncludeInBundle = true,
+                    SortOrder = 2
+                }
+            ]
+        };
+
+        db.BundleSaleTemplates.Add(template);
+        await db.SaveChangesAsync(ct);
+
+        var bundleSales = new[]
+        {
+            new BundleSale
+            {
+                BundleNo = $"BND-{now:yyyy}-00001",
+                BundleDate = now.Date.AddDays(-2),
+                CustomerId = customer.CustomerId,
+                CustomerSnapshotName = customer.DisplayName ?? customer.Name,
+                WarehouseId = warehouse.WarehouseId,
+                CashierUserId = user.UserId,
+                BundleSaleTemplateId = template.BundleSaleTemplateId,
+                BundleName = "Demo Bundle Draft",
+                BundleCode = "BND-DEMO-001",
+                Status = BundleSaleStatus.Draft,
+                ComponentSubtotal = items[0].SalePrice.GetValueOrDefault() + items[1].SalePrice.GetValueOrDefault(),
+                BundlePrice = 0m,
+                MarginAmount = -(items[0].SalePrice.GetValueOrDefault() + items[1].SalePrice.GetValueOrDefault()),
+                DiscountTotal = items[0].SalePrice.GetValueOrDefault() + items[1].SalePrice.GetValueOrDefault(),
+                TaxTotal = 0m,
+                GrandTotal = 0m,
+                CreatedAt = now.AddDays(-2),
+                Lines =
+                [
+                    new BundleSaleLine
+                    {
+                        ItemId = items[0].ItemId,
+                        Description = items[0].Name,
+                        Qty = 1m,
+                        UomId = uom.UomId,
+                        WarehouseId = warehouse.WarehouseId,
+                        UnitPrice = items[0].SalePrice.GetValueOrDefault(),
+                        LineTotal = items[0].SalePrice.GetValueOrDefault(),
+                        IncludeInBundle = true,
+                        IsComponent = true
+                    },
+                    new BundleSaleLine
+                    {
+                        ItemId = items[1].ItemId,
+                        Description = items[1].Name,
+                        Qty = 1m,
+                        UomId = uom.UomId,
+                        WarehouseId = warehouse.WarehouseId,
+                        UnitPrice = items[1].SalePrice.GetValueOrDefault(),
+                        LineTotal = items[1].SalePrice.GetValueOrDefault(),
+                        IncludeInBundle = true,
+                        IsComponent = true
+                    }
+                ]
+            },
+            new BundleSale
+            {
+                BundleNo = $"BND-{now:yyyy}-00002",
+                BundleDate = now.Date.AddDays(-1),
+                CustomerId = customer.CustomerId,
+                CustomerSnapshotName = customer.DisplayName ?? customer.Name,
+                WarehouseId = warehouse.WarehouseId,
+                CashierUserId = user.UserId,
+                BundleSaleTemplateId = template.BundleSaleTemplateId,
+                BundleName = "Demo Bundle Posted",
+                BundleCode = "BND-DEMO-001",
+                Status = BundleSaleStatus.Posted,
+                ComponentSubtotal = items[0].SalePrice.GetValueOrDefault() + items[1].SalePrice.GetValueOrDefault(),
+                BundlePrice = (items[0].SalePrice.GetValueOrDefault() + items[1].SalePrice.GetValueOrDefault()) - 10m,
+                MarginAmount = -10m,
+                DiscountTotal = 10m,
+                TaxTotal = 0m,
+                GrandTotal = (items[0].SalePrice.GetValueOrDefault() + items[1].SalePrice.GetValueOrDefault()) - 10m,
+                CreatedAt = now.AddDays(-1),
+                UpdatedAt = now.AddHours(-2),
+                Lines =
+                [
+                    new BundleSaleLine
+                    {
+                        ItemId = items[0].ItemId,
+                        Description = items[0].Name,
+                        Qty = 1m,
+                        UomId = uom.UomId,
+                        WarehouseId = warehouse.WarehouseId,
+                        UnitPrice = items[0].SalePrice.GetValueOrDefault(),
+                        LineTotal = items[0].SalePrice.GetValueOrDefault(),
+                        IncludeInBundle = true,
+                        IsComponent = true
+                    },
+                    new BundleSaleLine
+                    {
+                        ItemId = items[1].ItemId,
+                        Description = items[1].Name,
+                        Qty = 1m,
+                        UomId = uom.UomId,
+                        WarehouseId = warehouse.WarehouseId,
+                        UnitPrice = items[1].SalePrice.GetValueOrDefault(),
+                        LineTotal = items[1].SalePrice.GetValueOrDefault(),
+                        IncludeInBundle = true,
+                        IsComponent = true
+                    }
+                ]
+            },
+            new BundleSale
+            {
+                BundleNo = $"BND-{now:yyyy}-00003",
+                BundleDate = now.Date,
+                CustomerId = customer.CustomerId,
+                CustomerSnapshotName = customer.DisplayName ?? customer.Name,
+                WarehouseId = secondaryWarehouse.WarehouseId,
+                CashierUserId = user.UserId,
+                BundleSaleTemplateId = template.BundleSaleTemplateId,
+                BundleName = "Demo Bundle Cancelled",
+                BundleCode = "BND-DEMO-001",
+                Status = BundleSaleStatus.Cancelled,
+                ComponentSubtotal = items[0].SalePrice.GetValueOrDefault(),
+                BundlePrice = items[0].SalePrice.GetValueOrDefault(),
+                MarginAmount = 0m,
+                DiscountTotal = 0m,
+                TaxTotal = 0m,
+                GrandTotal = items[0].SalePrice.GetValueOrDefault(),
+                CreatedAt = now,
+                UpdatedAt = now,
+                Lines =
+                [
+                    new BundleSaleLine
+                    {
+                        ItemId = items[0].ItemId,
+                        Description = items[0].Name,
+                        Qty = 1m,
+                        UomId = uom.UomId,
+                        WarehouseId = secondaryWarehouse.WarehouseId,
+                        UnitPrice = items[0].SalePrice.GetValueOrDefault(),
+                        LineTotal = items[0].SalePrice.GetValueOrDefault(),
+                        IncludeInBundle = true,
+                        IsComponent = true
+                    }
+                ]
+            }
+        };
+
+        db.BundleSales.AddRange(bundleSales);
+        return true;
+    }
+
+    private static async Task<bool> SeedSampleSalesDocsAsync(ErpDbContext db, CancellationToken ct)
+    {
+        if (await db.SalesInvoices.AnyAsync(ct) || await db.SalesSlips.AnyAsync(ct))
+            return false;
+
+        var customer = await db.Customers.AsNoTracking()
+            .OrderBy(c => c.CustomerId)
+            .FirstOrDefaultAsync(ct);
+        var warehouse = await db.Warehouses.AsNoTracking()
+            .OrderBy(w => w.WarehouseId)
+            .FirstOrDefaultAsync(ct);
+        var secondaryWarehouse = await db.Warehouses.AsNoTracking()
+            .OrderByDescending(w => w.WarehouseId)
+            .FirstOrDefaultAsync(ct);
+        var items = await db.Items.AsNoTracking()
+            .OrderBy(i => i.ItemId)
+            .Take(2)
+            .ToListAsync(ct);
+        var uom = await db.Uoms.AsNoTracking()
+            .OrderBy(u => u.UomId)
+            .FirstOrDefaultAsync(ct);
+        var user = await db.Users.AsNoTracking()
+            .OrderBy(u => u.UserId)
+            .FirstOrDefaultAsync(ct);
+
+        if (customer is null || warehouse is null || secondaryWarehouse is null || items.Count < 2 || uom is null || user is null)
+            return false;
+
+        var postableItem = items[0];
+        var shortageItem = items[1];
+        var today = DateTime.UtcNow.Date;
+        var createdAt = DateTime.UtcNow.AddDays(-1);
+
+        db.SalesInvoices.AddRange(
+            new SalesInvoice
+            {
+                InvoiceNo = $"SI-{today:yyyy}-00001",
+                InvoiceDate = today.AddDays(-2),
+                CustomerId = customer.CustomerId,
+                CustomerSnapshotName = customer.Name,
+                CustomerSnapshotTaxNo = customer.TaxRegistrationNo,
+                WarehouseId = warehouse.WarehouseId,
+                InvoiceType = SalesInvoiceType.B2C,
+                Status = SalesInvoiceStatus.Draft,
+                Subtotal = 200m,
+                DiscountTotal = 0m,
+                TaxTotal = 0m,
+                GrandTotal = 200m,
+                RoundOff = 0m,
+                NetPayable = 200m,
+                PaidAmount = 0m,
+                BalanceAmount = 200m,
+                CreatedBy = user.UserId,
+                CreatedAt = createdAt,
+                Lines =
+                [
+                    new SalesInvoiceLine
+                    {
+                        ItemId = postableItem.ItemId,
+                        Description = postableItem.Name,
+                        Qty = 2m,
+                        FreeQty = 0m,
+                        UomId = uom.UomId,
+                        WarehouseId = warehouse.WarehouseId,
+                        UnitPrice = 100m,
+                        BaseCost = 0m,
+                        PriceSource = "seed",
+                        DiscountMode = SalesDiscountMode.Percentage,
+                        DiscountPct = 0m,
+                        DiscountAmount = 0m,
+                        NetUnitPrice = 100m,
+                        LineTotal = 200m,
+                        TaxPct = 0m,
+                        TaxAmount = 0m,
+                        IsFreeIssue = false
+                    }
+                ]
+            },
+            new SalesInvoice
+            {
+                InvoiceNo = $"SI-{today:yyyy}-00002",
+                InvoiceDate = today.AddDays(-1),
+                CustomerId = customer.CustomerId,
+                CustomerSnapshotName = customer.Name,
+                CustomerSnapshotTaxNo = customer.TaxRegistrationNo,
+                WarehouseId = secondaryWarehouse.WarehouseId,
+                InvoiceType = SalesInvoiceType.B2B,
+                Status = SalesInvoiceStatus.Draft,
+                Subtotal = 300m,
+                DiscountTotal = 0m,
+                TaxTotal = 0m,
+                GrandTotal = 300m,
+                RoundOff = 0m,
+                NetPayable = 300m,
+                PaidAmount = 0m,
+                BalanceAmount = 300m,
+                CreatedBy = user.UserId,
+                CreatedAt = createdAt,
+                Lines =
+                [
+                    new SalesInvoiceLine
+                    {
+                        ItemId = shortageItem.ItemId,
+                        Description = shortageItem.Name,
+                        Qty = 6m,
+                        FreeQty = 0m,
+                        UomId = uom.UomId,
+                        WarehouseId = secondaryWarehouse.WarehouseId,
+                        UnitPrice = 50m,
+                        BaseCost = 0m,
+                        PriceSource = "seed",
+                        DiscountMode = SalesDiscountMode.Percentage,
+                        DiscountPct = 0m,
+                        DiscountAmount = 0m,
+                        NetUnitPrice = 50m,
+                        LineTotal = 300m,
+                        TaxPct = 0m,
+                        TaxAmount = 0m,
+                        IsFreeIssue = false
+                    }
+                ]
+            },
+            new SalesInvoice
+            {
+                InvoiceNo = $"SI-{today:yyyy}-00003",
+                InvoiceDate = today,
+                CustomerId = customer.CustomerId,
+                CustomerSnapshotName = customer.Name,
+                CustomerSnapshotTaxNo = customer.TaxRegistrationNo,
+                WarehouseId = warehouse.WarehouseId,
+                InvoiceType = SalesInvoiceType.B2C,
+                Status = SalesInvoiceStatus.Posted,
+                Subtotal = 100m,
+                DiscountTotal = 0m,
+                TaxTotal = 0m,
+                GrandTotal = 100m,
+                RoundOff = 0m,
+                NetPayable = 100m,
+                PaidAmount = 100m,
+                BalanceAmount = 0m,
+                CreatedBy = user.UserId,
+                CreatedAt = createdAt,
+                UpdatedAt = DateTime.UtcNow,
+                Lines =
+                [
+                    new SalesInvoiceLine
+                    {
+                        ItemId = postableItem.ItemId,
+                        Description = postableItem.Name,
+                        Qty = 1m,
+                        FreeQty = 0m,
+                        UomId = uom.UomId,
+                        WarehouseId = warehouse.WarehouseId,
+                        UnitPrice = 100m,
+                        BaseCost = 0m,
+                        PriceSource = "seed",
+                        DiscountMode = SalesDiscountMode.Percentage,
+                        DiscountPct = 0m,
+                        DiscountAmount = 0m,
+                        NetUnitPrice = 100m,
+                        LineTotal = 100m,
+                        TaxPct = 0m,
+                        TaxAmount = 0m,
+                        IsFreeIssue = false
+                    }
+                ]
+            }
+        );
+
+        db.SalesSlips.AddRange(
+            new SalesSlip
+            {
+                SlipNo = $"SSL-{today:yyyy}-00001",
+                SlipDate = today.AddDays(-2),
+                CustomerId = customer.CustomerId,
+                CustomerSnapshotName = customer.Name,
+                WarehouseId = warehouse.WarehouseId,
+                CashierUserId = user.UserId,
+                Status = SalesSlipStatus.Draft,
+                Subtotal = 50m,
+                DiscountTotal = 0m,
+                TaxTotal = 0m,
+                GrandTotal = 50m,
+                PaidAmount = 0m,
+                BalanceAmount = 50m,
+                CreatedAt = createdAt,
+                Lines =
+                [
+                    new SalesSlipLine
+                    {
+                        ItemId = postableItem.ItemId,
+                        Description = postableItem.Name,
+                        Qty = 1m,
+                        FreeQty = 0m,
+                        UomId = uom.UomId,
+                        WarehouseId = warehouse.WarehouseId,
+                        UnitPrice = 50m,
+                        BaseCost = 0m,
+                        PriceSource = "seed",
+                        DiscountMode = SalesDiscountMode.Percentage,
+                        DiscountPct = 0m,
+                        DiscountAmount = 0m,
+                        NetUnitPrice = 50m,
+                        LineTotal = 50m,
+                        TaxPct = 0m,
+                        TaxAmount = 0m,
+                        IsFreeIssue = false
+                    }
+                ]
+            },
+            new SalesSlip
+            {
+                SlipNo = $"SSL-{today:yyyy}-00002",
+                SlipDate = today.AddDays(-1),
+                CustomerId = customer.CustomerId,
+                CustomerSnapshotName = customer.Name,
+                WarehouseId = secondaryWarehouse.WarehouseId,
+                CashierUserId = user.UserId,
+                Status = SalesSlipStatus.Draft,
+                Subtotal = 150m,
+                DiscountTotal = 15m,
+                TaxTotal = 0m,
+                GrandTotal = 135m,
+                PaidAmount = 0m,
+                BalanceAmount = 135m,
+                CreatedAt = createdAt,
+                Lines =
+                [
+                    new SalesSlipLine
+                    {
+                        ItemId = shortageItem.ItemId,
+                        Description = shortageItem.Name,
+                        Qty = 3m,
+                        FreeQty = 0m,
+                        UomId = uom.UomId,
+                        WarehouseId = secondaryWarehouse.WarehouseId,
+                        UnitPrice = 50m,
+                        BaseCost = 0m,
+                        PriceSource = "seed",
+                        DiscountMode = SalesDiscountMode.Percentage,
+                        DiscountPct = 10m,
+                        DiscountAmount = 15m,
+                        NetUnitPrice = 45m,
+                        LineTotal = 135m,
+                        TaxPct = 0m,
+                        TaxAmount = 0m,
+                        IsFreeIssue = false
+                    }
+                ]
+            }
+        );
+
+        return true;
+    }
 }

Backend/ERPCore/Infra/Persistence/ErpDbContext.cs

@@ -15,6 +15,7 @@ namespace ERPCore.Infra.Persistence;
 public class ErpDbContext : DbContext
 {
     private readonly ICurrentUser _currentUser;
+    private bool _writingAuditLogs;
 
     public ErpDbContext(DbContextOptions<ErpDbContext> options, ICurrentUser currentUser) : base(options)
     {
@@ -22,6 +23,7 @@ public class ErpDbContext : DbContext
     }
 
     // --- Master Data (docs/10 Part C.1) ---
+    public DbSet<Customer> Customers => Set<Customer>();
     public DbSet<Category> Categories => Set<Category>();
     public DbSet<SubCategory> SubCategories => Set<SubCategory>();
     public DbSet<Brand> Brands => Set<Brand>();
@@ -34,6 +36,7 @@ public class ErpDbContext : DbContext
     public DbSet<Vendor> Vendors => Set<Vendor>();
     public DbSet<Warehouse> Warehouses => Set<Warehouse>();
     public DbSet<Bin> Bins => Set<Bin>();
+    
     /// <summary>Singleton row (FR-MD-11).</summary>
     public DbSet<ProductConfig> ProductConfig => Set<ProductConfig>();
 
@@ -82,6 +85,16 @@ public class ErpDbContext : DbContext
     public DbSet<PurchaseReturn> PurchaseReturns => Set<PurchaseReturn>();
     public DbSet<PurchaseReturnLine> PurchaseReturnLines => Set<PurchaseReturnLine>();
 
+    // --- Sales (Phase 1) ---
+    public DbSet<SalesInvoice> SalesInvoices => Set<SalesInvoice>();
+    public DbSet<SalesInvoiceLine> SalesInvoiceLines => Set<SalesInvoiceLine>();
+    public DbSet<SalesSlip> SalesSlips => Set<SalesSlip>();
+    public DbSet<SalesSlipLine> SalesSlipLines => Set<SalesSlipLine>();
+    public DbSet<BundleSaleTemplate> BundleSaleTemplates => Set<BundleSaleTemplate>();
+    public DbSet<BundleSaleTemplateLine> BundleSaleTemplateLines => Set<BundleSaleTemplateLine>();
+    public DbSet<BundleSale> BundleSales => Set<BundleSale>();
+    public DbSet<BundleSaleLine> BundleSaleLines => Set<BundleSaleLine>();
+
     // --- Reference data (docs/10 Part C.7) ---
     public DbSet<ReasonCode> ReasonCodes => Set<ReasonCode>();
 
@@ -126,6 +139,21 @@ public class ErpDbContext : DbContext
     public DbSet<PayrollLineComponent> PayrollLineComponents => Set<PayrollLineComponent>();
     public DbSet<Payslip> Payslips => Set<Payslip>();
 
+    // --- Manufacturing: production templates (docs/30-BACKEND-PHASE2.md Part C) ---
+    public DbSet<ProductionTemplate> ProductionTemplates => Set<ProductionTemplate>();
+    public DbSet<TemplateStage> TemplateStages => Set<TemplateStage>();
+    public DbSet<StageEdge> StageEdges => Set<StageEdge>();
+    public DbSet<StageInput> StageInputs => Set<StageInput>();
+    public DbSet<StageOutput> StageOutputs => Set<StageOutput>();
+
+    // --- Manufacturing: production runs (docs/30-BACKEND-PHASE2.md Part C) ---
+    public DbSet<ProductionRun> ProductionRuns => Set<ProductionRun>();
+    public DbSet<RunStage> RunStages => Set<RunStage>();
+    public DbSet<RunEdge> RunEdges => Set<RunEdge>();
+    public DbSet<RunStageInput> RunStageInputs => Set<RunStageInput>();
+    public DbSet<RunStageOutput> RunStageOutputs => Set<RunStageOutput>();
+    public DbSet<RunStageEvent> RunStageEvents => Set<RunStageEvent>();
+
     protected override void OnModelCreating(ModelBuilder modelBuilder)
     {
         base.OnModelCreating(modelBuilder);
@@ -163,24 +191,44 @@ public class ErpDbContext : DbContext
     // persists the logs without re-auditing them.
     public override async Task<int> SaveChangesAsync(bool acceptAllChangesOnSuccess, CancellationToken ct = default)
     {
-        var pending = AuditScribe.Capture(ChangeTracker);
+        IReadOnlyList<PendingAudit> pending = _writingAuditLogs
+            ? Array.Empty<PendingAudit>()
+            : AuditScribe.Capture(ChangeTracker);
         var result = await base.SaveChangesAsync(acceptAllChangesOnSuccess, ct);
         if (pending.Count > 0)
         {
-            WriteAuditLogs(pending);
-            await base.SaveChangesAsync(acceptAllChangesOnSuccess, ct);
+            try
+            {
+                _writingAuditLogs = true;
+                WriteAuditLogs(pending);
+                await base.SaveChangesAsync(acceptAllChangesOnSuccess, ct);
+            }
+            finally
+            {
+                _writingAuditLogs = false;
+            }
         }
         return result;
     }
 
     public override int SaveChanges(bool acceptAllChangesOnSuccess)
     {
-        var pending = AuditScribe.Capture(ChangeTracker);
+        IReadOnlyList<PendingAudit> pending = _writingAuditLogs
+            ? Array.Empty<PendingAudit>()
+            : AuditScribe.Capture(ChangeTracker);
         var result = base.SaveChanges(acceptAllChangesOnSuccess);
         if (pending.Count > 0)
         {
-            WriteAuditLogs(pending);
-            base.SaveChanges(acceptAllChangesOnSuccess);
+            try
+            {
+                _writingAuditLogs = true;
+                WriteAuditLogs(pending);
+                base.SaveChanges(acceptAllChangesOnSuccess);
+            }
+            finally
+            {
+                _writingAuditLogs = false;
+            }
         }
         return result;
     }

Backend/ERPCore/Infra/Persistence/Migrations/20260716134938_AddBrandsSubcategoriesItemTypesAndProductConfig.cs

@@ -1,442 +0,0 @@
-using System;
-using Microsoft.EntityFrameworkCore.Migrations;
-using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
-
-#nullable disable
-
-namespace ERPCore.Infra.Persistence.Migrations
-{
-    /// <summary>
-    /// Adds the Brand / SubCategory / ItemType masters and the singleton product config,
-    /// and converts CATEGORY from a self-nesting tree into a fixed two-level
-    /// Category → SubCategory hierarchy (docs/10 Part C.1).
-    /// <para>
-    /// <b>This migration carries data, not just DDL.</b> The scaffolded version dropped
-    /// <c>categories.ParentId</c> outright, which would have silently flattened every
-    /// child category into a root and left items pointing at what is now a top-level
-    /// category — losing the parent entirely. The hand-written steps below (marked
-    /// "data migration") move child categories into <c>subcategories</c> and repoint items
-    /// onto the correct (category, subcategory) pair before the column goes away.
-    /// </para>
-    /// </summary>
-    public partial class AddBrandsSubcategoriesItemTypesAndProductConfig : Migration
-    {
-        /// <inheritdoc />
-        protected override void Up(MigrationBuilder migrationBuilder)
-        {
-            // NOTE: the ParentId drop is deliberately deferred to the bottom of this method —
-            // the data migration reads it. Order here is load-bearing.
-            migrationBuilder.RenameColumn(
-                name: "ItemType",
-                table: "items",
-                newName: "StockNature");
-
-            migrationBuilder.AddColumn<int>(
-                name: "BrandId",
-                table: "items",
-                type: "integer",
-                nullable: true);
-
-            migrationBuilder.AddColumn<int>(
-                name: "SubCategoryId",
-                table: "items",
-                type: "integer",
-                nullable: true);
-
-            migrationBuilder.AddColumn<DateTime>(
-                name: "CreatedAt",
-                table: "categories",
-                type: "timestamp with time zone",
-                nullable: false,
-                defaultValue: new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified));
-
-            migrationBuilder.AddColumn<string>(
-                name: "Status",
-                table: "categories",
-                type: "character varying(20)",
-                maxLength: 20,
-                nullable: false,
-                defaultValue: "Active");
-
-            migrationBuilder.AddColumn<DateTime>(
-                name: "UpdatedAt",
-                table: "categories",
-                type: "timestamp with time zone",
-                nullable: true);
-
-            migrationBuilder.AddColumn<uint>(
-                name: "xmin",
-                table: "categories",
-                type: "xid",
-                rowVersion: true,
-                nullable: false,
-                defaultValue: 0u);
-
-            migrationBuilder.CreateTable(
-                name: "brands",
-                columns: table => new
-                {
-                    BrandId = table.Column<int>(type: "integer", nullable: false)
-                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
-                    Name = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: false),
-                    Status = table.Column<string>(type: "character varying(20)", maxLength: 20, nullable: false, defaultValue: "Active"),
-                    CreatedAt = table.Column<DateTime>(type: "timestamp with time zone", nullable: false),
-                    UpdatedAt = table.Column<DateTime>(type: "timestamp with time zone", nullable: true),
-                    xmin = table.Column<uint>(type: "xid", rowVersion: true, nullable: false)
-                },
-                constraints: table =>
-                {
-                    table.PrimaryKey("PK_brands", x => x.BrandId);
-                });
-
-            migrationBuilder.CreateTable(
-                name: "item_types",
-                columns: table => new
-                {
-                    ItemTypeId = table.Column<int>(type: "integer", nullable: false)
-                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
-                    Name = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: false),
-                    Status = table.Column<string>(type: "character varying(20)", maxLength: 20, nullable: false, defaultValue: "Active"),
-                    CreatedAt = table.Column<DateTime>(type: "timestamp with time zone", nullable: false),
-                    UpdatedAt = table.Column<DateTime>(type: "timestamp with time zone", nullable: true),
-                    xmin = table.Column<uint>(type: "xid", rowVersion: true, nullable: false)
-                },
-                constraints: table =>
-                {
-                    table.PrimaryKey("PK_item_types", x => x.ItemTypeId);
-                });
-
-            migrationBuilder.CreateTable(
-                name: "product_config",
-                columns: table => new
-                {
-                    ConfigId = table.Column<int>(type: "integer", nullable: false),
-                    SubcategoriesEnabled = table.Column<bool>(type: "boolean", nullable: false, defaultValue: true),
-                    BrandsEnabled = table.Column<bool>(type: "boolean", nullable: false, defaultValue: true),
-                    ItemTypesEnabled = table.Column<bool>(type: "boolean", nullable: false, defaultValue: true),
-                    UpdatedAt = table.Column<DateTime>(type: "timestamp with time zone", nullable: true),
-                    UpdatedBy = table.Column<int>(type: "integer", nullable: true),
-                    xmin = table.Column<uint>(type: "xid", rowVersion: true, nullable: false)
-                },
-                constraints: table =>
-                {
-                    table.PrimaryKey("PK_product_config", x => x.ConfigId);
-                    table.CheckConstraint("ck_product_config_singleton", "\"ConfigId\" = 1");
-                    table.ForeignKey(
-                        name: "FK_product_config_users_UpdatedBy",
-                        column: x => x.UpdatedBy,
-                        principalTable: "users",
-                        principalColumn: "UserId",
-                        onDelete: ReferentialAction.Restrict);
-                });
-
-            migrationBuilder.CreateTable(
-                name: "subcategories",
-                columns: table => new
-                {
-                    SubCategoryId = table.Column<int>(type: "integer", nullable: false)
-                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
-                    Name = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: false),
-                    CategoryId = table.Column<int>(type: "integer", nullable: false),
-                    Status = table.Column<string>(type: "character varying(20)", maxLength: 20, nullable: false, defaultValue: "Active"),
-                    CreatedAt = table.Column<DateTime>(type: "timestamp with time zone", nullable: false),
-                    UpdatedAt = table.Column<DateTime>(type: "timestamp with time zone", nullable: true),
-                    xmin = table.Column<uint>(type: "xid", rowVersion: true, nullable: false)
-                },
-                constraints: table =>
-                {
-                    table.PrimaryKey("PK_subcategories", x => x.SubCategoryId);
-                    table.ForeignKey(
-                        name: "FK_subcategories_categories_CategoryId",
-                        column: x => x.CategoryId,
-                        principalTable: "categories",
-                        principalColumn: "CategoryId",
-                        onDelete: ReferentialAction.Restrict);
-                });
-
-            // ---------------------------------------------------------------------------
-            // DATA MIGRATION — must run before ParentId is dropped.
-            // ---------------------------------------------------------------------------
-
-            // Existing categories predate CreatedAt; the added column defaulted them to
-            // 0001-01-01. Stamp them with the migration time instead of a sentinel date.
-            migrationBuilder.Sql(@"
-                UPDATE categories SET ""CreatedAt"" = NOW() AT TIME ZONE 'utc';
-            ");
-
-            // Carry the old category id alongside each new subcategory so items can be
-            // repointed by join below. Dropped again once the repoint is done.
-            migrationBuilder.Sql(@"
-                ALTER TABLE subcategories ADD COLUMN legacy_category_id integer;
-            ");
-
-            // Walk the old tree to its roots. The previous model allowed unlimited nesting,
-            // but the new one is exactly two levels — so a category at any depth below the
-            // root collapses into a subcategory of its ROOT ancestor (a grandchild cannot
-            // become a subcategory of its immediate parent, since that parent is itself
-            // ceasing to be a category).
-            migrationBuilder.Sql(@"
-                WITH RECURSIVE tree AS (
-                    SELECT ""CategoryId"", ""ParentId"", ""Name"", ""CategoryId"" AS root_id
-                    FROM categories
-                    WHERE ""ParentId"" IS NULL
-                    UNION ALL
-                    SELECT c.""CategoryId"", c.""ParentId"", c.""Name"", t.root_id
-                    FROM categories c
-                    JOIN tree t ON c.""ParentId"" = t.""CategoryId""
-                )
-                INSERT INTO subcategories (""Name"", ""CategoryId"", ""Status"", ""CreatedAt"", legacy_category_id)
-                SELECT t.""Name"", t.root_id, 'Active', NOW() AT TIME ZONE 'utc', t.""CategoryId""
-                FROM tree t
-                WHERE t.""ParentId"" IS NOT NULL;
-            ");
-
-            // Repoint items: an item that pointed at a child category now carries the root
-            // category plus the subcategory it actually meant.
-            migrationBuilder.Sql(@"
-                UPDATE items i
-                SET ""SubCategoryId"" = s.""SubCategoryId"",
-                    ""CategoryId""    = s.""CategoryId""
-                FROM subcategories s
-                WHERE s.legacy_category_id = i.""CategoryId"";
-            ");
-
-            // The self-FK must go before the delete, or RESTRICT rejects removing a parent
-            // whose own child row is still present.
-            migrationBuilder.DropForeignKey(
-                name: "FK_categories_categories_ParentId",
-                table: "categories");
-
-            // Every non-root category now lives in `subcategories`, and no item references
-            // one any more (repointed above), so the rows can go.
-            migrationBuilder.Sql(@"
-                DELETE FROM categories WHERE ""ParentId"" IS NOT NULL;
-                ALTER TABLE subcategories DROP COLUMN legacy_category_id;
-            ");
-
-            migrationBuilder.DropIndex(
-                name: "IX_categories_ParentId",
-                table: "categories");
-
-            migrationBuilder.DropColumn(
-                name: "ParentId",
-                table: "categories");
-
-            // Seed the singleton config (FR-MD-11) — all features on. Item writes read this
-            // row, so it must exist before the app serves a single request.
-            migrationBuilder.Sql(@"
-                INSERT INTO product_config (""ConfigId"", ""SubcategoriesEnabled"", ""BrandsEnabled"", ""ItemTypesEnabled"")
-                VALUES (1, TRUE, TRUE, TRUE)
-                ON CONFLICT (""ConfigId"") DO NOTHING;
-            ");
-
-            // ---------------------------------------------------------------------------
-
-            migrationBuilder.CreateIndex(
-                name: "IX_items_BrandId",
-                table: "items",
-                column: "BrandId");
-
-            migrationBuilder.CreateIndex(
-                name: "IX_items_SubCategoryId",
-                table: "items",
-                column: "SubCategoryId");
-
-            migrationBuilder.CreateIndex(
-                name: "IX_categories_Name",
-                table: "categories",
-                column: "Name",
-                unique: true);
-
-            migrationBuilder.CreateIndex(
-                name: "IX_categories_Status",
-                table: "categories",
-                column: "Status");
-
-            migrationBuilder.CreateIndex(
-                name: "IX_brands_Name",
-                table: "brands",
-                column: "Name",
-                unique: true);
-
-            migrationBuilder.CreateIndex(
-                name: "IX_brands_Status",
-                table: "brands",
-                column: "Status");
-
-            migrationBuilder.CreateIndex(
-                name: "IX_item_types_Name",
-                table: "item_types",
-                column: "Name",
-                unique: true);
-
-            migrationBuilder.CreateIndex(
-                name: "IX_item_types_Status",
-                table: "item_types",
-                column: "Status");
-
-            migrationBuilder.CreateIndex(
-                name: "IX_product_config_UpdatedBy",
-                table: "product_config",
-                column: "UpdatedBy");
-
-            migrationBuilder.CreateIndex(
-                name: "IX_subcategories_CategoryId_Name",
-                table: "subcategories",
-                columns: new[] { "CategoryId", "Name" },
-                unique: true);
-
-            migrationBuilder.CreateIndex(
-                name: "IX_subcategories_Status",
-                table: "subcategories",
-                column: "Status");
-
-            migrationBuilder.AddForeignKey(
-                name: "FK_items_brands_BrandId",
-                table: "items",
-                column: "BrandId",
-                principalTable: "brands",
-                principalColumn: "BrandId",
-                onDelete: ReferentialAction.Restrict);
-
-            migrationBuilder.AddForeignKey(
-                name: "FK_items_subcategories_SubCategoryId",
-                table: "items",
-                column: "SubCategoryId",
-                principalTable: "subcategories",
-                principalColumn: "SubCategoryId",
-                onDelete: ReferentialAction.Restrict);
-        }
-
-        /// <summary>
-        /// Reverses the schema change and puts the subcategory data back where it came from.
-        /// <para>
-        /// The scaffolded version simply dropped <c>subcategories</c>, which would have
-        /// discarded exactly what <see cref="Up"/> preserved. Instead each subcategory is
-        /// restored as a child category and its items are repointed back onto it. This is
-        /// not perfectly lossless: the old tree's depth is gone (a former grandchild comes
-        /// back as a direct child of its root), and Brand data cannot survive a schema that
-        /// has nowhere to put it.
-        /// </para>
-        /// </summary>
-        protected override void Down(MigrationBuilder migrationBuilder)
-        {
-            migrationBuilder.DropForeignKey(
-                name: "FK_items_brands_BrandId",
-                table: "items");
-
-            migrationBuilder.DropForeignKey(
-                name: "FK_items_subcategories_SubCategoryId",
-                table: "items");
-
-            // Restore the parent column + self-FK first so subcategories have somewhere to
-            // land, then move them back before the table is dropped.
-            migrationBuilder.AddColumn<int>(
-                name: "ParentId",
-                table: "categories",
-                type: "integer",
-                nullable: true);
-
-            // ---------------------------------------------------------------------------
-            // DATA MIGRATION (reverse) — must run before `subcategories` is dropped.
-            // ---------------------------------------------------------------------------
-
-            migrationBuilder.Sql(@"
-                ALTER TABLE categories ADD COLUMN legacy_subcategory_id integer;
-            ");
-
-            // Each subcategory becomes a child category again under the same parent.
-            migrationBuilder.Sql(@"
-                INSERT INTO categories (""Name"", ""ParentId"", ""CreatedAt"", ""Status"", legacy_subcategory_id)
-                SELECT s.""Name"", s.""CategoryId"", s.""CreatedAt"", s.""Status"", s.""SubCategoryId""
-                FROM subcategories s;
-            ");
-
-            // Items that carried a subcategory point back at the restored child category.
-            migrationBuilder.Sql(@"
-                UPDATE items i
-                SET ""CategoryId"" = c.""CategoryId""
-                FROM categories c
-                WHERE c.legacy_subcategory_id = i.""SubCategoryId"";
-            ");
-
-            migrationBuilder.Sql(@"
-                ALTER TABLE categories DROP COLUMN legacy_subcategory_id;
-            ");
-
-            // ---------------------------------------------------------------------------
-
-            migrationBuilder.DropTable(
-                name: "brands");
-
-            migrationBuilder.DropTable(
-                name: "item_types");
-
-            migrationBuilder.DropTable(
-                name: "product_config");
-
-            migrationBuilder.DropTable(
-                name: "subcategories");
-
-            migrationBuilder.DropIndex(
-                name: "IX_items_BrandId",
-                table: "items");
-
-            migrationBuilder.DropIndex(
-                name: "IX_items_SubCategoryId",
-                table: "items");
-
-            migrationBuilder.DropIndex(
-                name: "IX_categories_Name",
-                table: "categories");
-
-            migrationBuilder.DropIndex(
-                name: "IX_categories_Status",
-                table: "categories");
-
-            migrationBuilder.DropColumn(
-                name: "BrandId",
-                table: "items");
-
-            migrationBuilder.DropColumn(
-                name: "SubCategoryId",
-                table: "items");
-
-            migrationBuilder.DropColumn(
-                name: "CreatedAt",
-                table: "categories");
-
-            migrationBuilder.DropColumn(
-                name: "Status",
-                table: "categories");
-
-            migrationBuilder.DropColumn(
-                name: "UpdatedAt",
-                table: "categories");
-
-            migrationBuilder.DropColumn(
-                name: "xmin",
-                table: "categories");
-
-            migrationBuilder.RenameColumn(
-                name: "StockNature",
-                table: "items",
-                newName: "ItemType");
-
-            // ParentId itself was re-added at the top of this method, ahead of the reverse
-            // data migration that populates it.
-            migrationBuilder.CreateIndex(
-                name: "IX_categories_ParentId",
-                table: "categories",
-                column: "ParentId");
-
-            migrationBuilder.AddForeignKey(
-                name: "FK_categories_categories_ParentId",
-                table: "categories",
-                column: "ParentId",
-                principalTable: "categories",
-                principalColumn: "CategoryId",
-                onDelete: ReferentialAction.Restrict);
-        }
-    }
-}

Backend/ERPCore/Infra/Persistence/Migrations/20260718081219_ini2.cs

@@ -1,22 +0,0 @@
-using Microsoft.EntityFrameworkCore.Migrations;
-
-#nullable disable
-
-namespace ERPCore.Infra.Persistence.Migrations
-{
-    /// <inheritdoc />
-    public partial class ini2 : Migration
-    {
-        /// <inheritdoc />
-        protected override void Up(MigrationBuilder migrationBuilder)
-        {
-
-        }
-
-        /// <inheritdoc />
-        protected override void Down(MigrationBuilder migrationBuilder)
-        {
-
-        }
-    }
-}

Backend/ERPCore/Infra/Persistence/Migrations/20260718092655_AddRolesNavPermissions.cs

@@ -1,303 +0,0 @@
-using System;
-using Microsoft.EntityFrameworkCore.Migrations;
-using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
-
-#nullable disable
-
-#pragma warning disable CA1814 // Prefer jagged arrays over multidimensional
-
-namespace ERPCore.Infra.Persistence.Migrations
-{
-    /// <inheritdoc />
-    public partial class AddRolesNavPermissions : Migration
-    {
-        /// <inheritdoc />
-        protected override void Up(MigrationBuilder migrationBuilder)
-        {
-            migrationBuilder.AddColumn<int>(
-                name: "RoleId",
-                table: "users",
-                type: "integer",
-                nullable: true);
-
-            migrationBuilder.CreateTable(
-                name: "nav_items",
-                columns: table => new
-                {
-                    NavItemId = table.Column<int>(type: "integer", nullable: false)
-                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
-                    Code = table.Column<string>(type: "character varying(50)", maxLength: 50, nullable: false),
-                    Label = table.Column<string>(type: "character varying(100)", maxLength: 100, nullable: false),
-                    Icon = table.Column<string>(type: "character varying(50)", maxLength: 50, nullable: true),
-                    Href = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: true),
-                    SortOrder = table.Column<int>(type: "integer", nullable: false),
-                    Status = table.Column<string>(type: "character varying(20)", maxLength: 20, nullable: false, defaultValue: "Active")
-                },
-                constraints: table =>
-                {
-                    table.PrimaryKey("PK_nav_items", x => x.NavItemId);
-                });
-
-            migrationBuilder.CreateTable(
-                name: "roles",
-                columns: table => new
-                {
-                    RoleId = table.Column<int>(type: "integer", nullable: false)
-                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
-                    auth_role_id = table.Column<Guid>(type: "uuid", nullable: false),
-                    Code = table.Column<string>(type: "character varying(50)", maxLength: 50, nullable: false),
-                    Name = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: false),
-                    IsSystemRole = table.Column<bool>(type: "boolean", nullable: false, defaultValue: false),
-                    Status = table.Column<string>(type: "character varying(20)", maxLength: 20, nullable: false, defaultValue: "Active"),
-                    CreatedAt = table.Column<DateTime>(type: "timestamp with time zone", nullable: false),
-                    UpdatedAt = table.Column<DateTime>(type: "timestamp with time zone", nullable: true),
-                    xmin = table.Column<uint>(type: "xid", rowVersion: true, nullable: false)
-                },
-                constraints: table =>
-                {
-                    table.PrimaryKey("PK_roles", x => x.RoleId);
-                });
-
-            migrationBuilder.CreateTable(
-                name: "sub_nav_items",
-                columns: table => new
-                {
-                    SubNavItemId = table.Column<int>(type: "integer", nullable: false)
-                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
-                    NavItemId = table.Column<int>(type: "integer", nullable: false),
-                    Code = table.Column<string>(type: "character varying(50)", maxLength: 50, nullable: false),
-                    Label = table.Column<string>(type: "character varying(100)", maxLength: 100, nullable: false),
-                    Icon = table.Column<string>(type: "character varying(50)", maxLength: 50, nullable: true),
-                    Href = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: true),
-                    SortOrder = table.Column<int>(type: "integer", nullable: false),
-                    Status = table.Column<string>(type: "character varying(20)", maxLength: 20, nullable: false, defaultValue: "Active")
-                },
-                constraints: table =>
-                {
-                    table.PrimaryKey("PK_sub_nav_items", x => x.SubNavItemId);
-                    table.ForeignKey(
-                        name: "FK_sub_nav_items_nav_items_NavItemId",
-                        column: x => x.NavItemId,
-                        principalTable: "nav_items",
-                        principalColumn: "NavItemId",
-                        onDelete: ReferentialAction.Cascade);
-                });
-
-            migrationBuilder.CreateTable(
-                name: "permissions",
-                columns: table => new
-                {
-                    PermissionId = table.Column<int>(type: "integer", nullable: false)
-                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
-                    Code = table.Column<string>(type: "character varying(80)", maxLength: 80, nullable: false),
-                    NavItemId = table.Column<int>(type: "integer", nullable: true),
-                    SubNavItemId = table.Column<int>(type: "integer", nullable: true)
-                },
-                constraints: table =>
-                {
-                    table.PrimaryKey("PK_permissions", x => x.PermissionId);
-                    table.ForeignKey(
-                        name: "FK_permissions_nav_items_NavItemId",
-                        column: x => x.NavItemId,
-                        principalTable: "nav_items",
-                        principalColumn: "NavItemId",
-                        onDelete: ReferentialAction.Cascade);
-                    table.ForeignKey(
-                        name: "FK_permissions_sub_nav_items_SubNavItemId",
-                        column: x => x.SubNavItemId,
-                        principalTable: "sub_nav_items",
-                        principalColumn: "SubNavItemId",
-                        onDelete: ReferentialAction.Cascade);
-                });
-
-            migrationBuilder.CreateTable(
-                name: "role_permissions",
-                columns: table => new
-                {
-                    RoleId = table.Column<int>(type: "integer", nullable: false),
-                    PermissionId = table.Column<int>(type: "integer", nullable: false)
-                },
-                constraints: table =>
-                {
-                    table.PrimaryKey("PK_role_permissions", x => new { x.RoleId, x.PermissionId });
-                    table.ForeignKey(
-                        name: "FK_role_permissions_permissions_PermissionId",
-                        column: x => x.PermissionId,
-                        principalTable: "permissions",
-                        principalColumn: "PermissionId",
-                        onDelete: ReferentialAction.Cascade);
-                    table.ForeignKey(
-                        name: "FK_role_permissions_roles_RoleId",
-                        column: x => x.RoleId,
-                        principalTable: "roles",
-                        principalColumn: "RoleId",
-                        onDelete: ReferentialAction.Cascade);
-                });
-
-            migrationBuilder.InsertData(
-                table: "nav_items",
-                columns: new[] { "NavItemId", "Code", "Href", "Icon", "Label", "SortOrder" },
-                values: new object[,]
-                {
-                    { 1, "dashboard", "/dashboard", null, "Dashboard", 1 },
-                    { 2, "products", "/dashboard/products", null, "Products", 2 },
-                    { 3, "vendors", "/dashboard/vendors", null, "Vendors", 3 },
-                    { 4, "procurement", "/dashboard/procurement", null, "Procurement", 4 },
-                    { 5, "receiving", "/dashboard/receiving/grn", null, "Receiving", 5 },
-                    { 6, "stock", "/dashboard/stock", null, "Stock", 6 },
-                    { 7, "warehouses", "/dashboard/warehouse", null, "Warehouses", 7 },
-                    { 8, "orders", "/dashboard/orders", null, "Orders", 8 },
-                    { 9, "settings", "/dashboard/settings", null, "Settings", 9 },
-                    { 10, "help", "/dashboard/help", null, "Help", 10 }
-                });
-
-            migrationBuilder.UpdateData(
-                table: "users",
-                keyColumn: "UserId",
-                keyValue: 1,
-                column: "RoleId",
-                value: null);
-
-            migrationBuilder.InsertData(
-                table: "permissions",
-                columns: new[] { "PermissionId", "Code", "NavItemId", "SubNavItemId" },
-                values: new object[,]
-                {
-                    { 1, "NAV:dashboard", 1, null },
-                    { 2, "NAV:products", 2, null },
-                    { 3, "NAV:vendors", 3, null },
-                    { 4, "NAV:procurement", 4, null },
-                    { 5, "NAV:receiving", 5, null },
-                    { 6, "NAV:stock", 6, null },
-                    { 7, "NAV:warehouses", 7, null },
-                    { 8, "NAV:orders", 8, null },
-                    { 9, "NAV:settings", 9, null },
-                    { 10, "NAV:help", 10, null }
-                });
-
-            migrationBuilder.InsertData(
-                table: "sub_nav_items",
-                columns: new[] { "SubNavItemId", "Code", "Href", "Icon", "Label", "NavItemId", "SortOrder" },
-                values: new object[,]
-                {
-                    { 1, "products.item", "/dashboard/products", null, "Item", 2, 1 },
-                    { 2, "products.category", "/dashboard/products/categories", null, "Category", 2, 2 },
-                    { 3, "products.brand", "/dashboard/products/brands", null, "Brand", 2, 3 },
-                    { 4, "products.item-type", "/dashboard/products/item-types", null, "Item Type", 2, 4 },
-                    { 5, "products.uom", "/dashboard/products/uoms", null, "UOM", 2, 5 },
-                    { 6, "products.configuration", "/dashboard/products/settings", null, "Configuration", 2, 6 },
-                    { 7, "settings.roles", "/dashboard/settings/roles", null, "Roles", 9, 1 },
-                    { 8, "settings.users", "/dashboard/settings/users", null, "Users", 9, 2 }
-                });
-
-            migrationBuilder.InsertData(
-                table: "permissions",
-                columns: new[] { "PermissionId", "Code", "NavItemId", "SubNavItemId" },
-                values: new object[,]
-                {
-                    { 11, "NAV:products.item", null, 1 },
-                    { 12, "NAV:products.category", null, 2 },
-                    { 13, "NAV:products.brand", null, 3 },
-                    { 14, "NAV:products.item-type", null, 4 },
-                    { 15, "NAV:products.uom", null, 5 },
-                    { 16, "NAV:products.configuration", null, 6 },
-                    { 17, "NAV:settings.roles", null, 7 },
-                    { 18, "NAV:settings.users", null, 8 }
-                });
-
-            migrationBuilder.CreateIndex(
-                name: "IX_users_RoleId",
-                table: "users",
-                column: "RoleId");
-
-            migrationBuilder.CreateIndex(
-                name: "IX_nav_items_Code",
-                table: "nav_items",
-                column: "Code",
-                unique: true);
-
-            migrationBuilder.CreateIndex(
-                name: "IX_permissions_Code",
-                table: "permissions",
-                column: "Code",
-                unique: true);
-
-            migrationBuilder.CreateIndex(
-                name: "IX_permissions_NavItemId",
-                table: "permissions",
-                column: "NavItemId");
-
-            migrationBuilder.CreateIndex(
-                name: "IX_permissions_SubNavItemId",
-                table: "permissions",
-                column: "SubNavItemId");
-
-            migrationBuilder.CreateIndex(
-                name: "IX_role_permissions_PermissionId",
-                table: "role_permissions",
-                column: "PermissionId");
-
-            migrationBuilder.CreateIndex(
-                name: "IX_roles_auth_role_id",
-                table: "roles",
-                column: "auth_role_id",
-                unique: true);
-
-            migrationBuilder.CreateIndex(
-                name: "IX_roles_Code",
-                table: "roles",
-                column: "Code",
-                unique: true);
-
-            migrationBuilder.CreateIndex(
-                name: "IX_sub_nav_items_Code",
-                table: "sub_nav_items",
-                column: "Code",
-                unique: true);
-
-            migrationBuilder.CreateIndex(
-                name: "IX_sub_nav_items_NavItemId",
-                table: "sub_nav_items",
-                column: "NavItemId");
-
-            migrationBuilder.AddForeignKey(
-                name: "FK_users_roles_RoleId",
-                table: "users",
-                column: "RoleId",
-                principalTable: "roles",
-                principalColumn: "RoleId",
-                onDelete: ReferentialAction.Restrict);
-        }
-
-        /// <inheritdoc />
-        protected override void Down(MigrationBuilder migrationBuilder)
-        {
-            migrationBuilder.DropForeignKey(
-                name: "FK_users_roles_RoleId",
-                table: "users");
-
-            migrationBuilder.DropTable(
-                name: "role_permissions");
-
-            migrationBuilder.DropTable(
-                name: "permissions");
-
-            migrationBuilder.DropTable(
-                name: "roles");
-
-            migrationBuilder.DropTable(
-                name: "sub_nav_items");
-
-            migrationBuilder.DropTable(
-                name: "nav_items");
-
-            migrationBuilder.DropIndex(
-                name: "IX_users_RoleId",
-                table: "users");
-
-            migrationBuilder.DropColumn(
-                name: "RoleId",
-                table: "users");
-        }
-    }
-}

Backend/ERPCore/Program.cs

@@ -1,20 +1,24 @@
 using System.Text.Json.Serialization;
 using ERPCore.Infra.Auth;
 using ERPCore.Infra.Auth.AuthHex;
+using ERPCore.Infra.Gl;
 using ERPCore.Infra.Persistence;
 using ERPCore.Infra.Storage;
 using ERPCore.Infra.UoW;
 using ERPCore.Repositories;
 using ERPCore.Repositories.Interfaces;
 using ERPCore.Services;
+using ERPCore.Services.Interfaces;
 using ERPCore.Services.Auth;
 using ERPCore.Services.Hrm;
-using ERPCore.Services.Interfaces;
+using ERPCore.Services.Production;
 using ERPCore.Services.Stock;
 using ERPCore.System.Errors;
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Diagnostics;
 using Microsoft.OpenApi;
+using Npgsql;
 using Serilog;
 
 var builder = WebApplication.CreateBuilder(args);
@@ -30,7 +34,10 @@ builder.Services.AddControllers()
 
 // EF Core + PostgreSQL
 builder.Services.AddDbContext<ErpDbContext>(o =>
-    o.UseNpgsql(builder.Configuration.GetConnectionString("DefaultConnection")));
+{
+    o.UseNpgsql(builder.Configuration.GetConnectionString("DefaultConnection"));
+    o.ConfigureWarnings(w => w.Ignore(RelationalEventId.PendingModelChangesWarning));
+});
 
 // ProblemDetails (RFC 7807) + domain-exception mapping
 builder.Services.AddProblemDetails();
@@ -50,6 +57,15 @@ builder.Services.AddScoped<IAuthUserService, AuthUserService>();
 builder.Services.AddScoped<IAuthRecoveryService, AuthRecoveryService>();
 builder.Services.AddScoped<IAuthAltService, AuthAltService>();
 
+// General Ledger service proxy → external GL microservice (docs/12-GENERAL-LEDGER-INTEGRATION.md)
+builder.Services.AddHttpClient<IGeneralLedgerClient, GeneralLedgerClient>(c =>
+{
+    var baseUrl = builder.Configuration["GeneralLedgerService:BaseUrl"]
+        ?? throw new InvalidOperationException("GeneralLedgerService:BaseUrl is not configured.");
+    c.BaseAddress = new Uri(baseUrl);
+});
+builder.Services.AddScoped<IGeneralLedgerService, GeneralLedgerService>();
+
 // Current-user (audit actor). AuthHex has no sub/nameid → a claims transformation
 // JIT-provisions a local shadow user and injects the local `int` id as `nameid`.
 builder.Services.AddHttpContextAccessor();
@@ -61,11 +77,13 @@ builder.Services.AddScoped<IUnitOfWork, UnitOfWork>();
 builder.Services.AddScoped(typeof(IRepository<>), typeof(Repository<>));
 
 // Master-data services (docs/11 §2)
+builder.Services.AddScoped<ICustomerService, CustomerService>();
 builder.Services.AddScoped<IItemService, ItemService>();
 builder.Services.AddScoped<IUomService, UomService>();
 builder.Services.AddScoped<ICategoryService, CategoryService>();
 builder.Services.AddScoped<IBrandService, BrandService>();
 builder.Services.AddScoped<IItemTypeService, ItemTypeService>();
+//builder.Services.AddScoped<ICompanyProfileService, CompanyProfileService>();
 builder.Services.AddScoped<IProductConfigService, ProductConfigService>();
 builder.Services.AddScoped<IVendorService, VendorService>();
 builder.Services.AddScoped<IWarehouseService, WarehouseService>();
@@ -81,10 +99,23 @@ builder.Services.AddScoped<IRfqService, RfqService>();
 builder.Services.AddScoped<IPurchaseOrderService, PurchaseOrderService>();
 
 // Stock core + goods receipt (docs/11 §4–5)
+builder.Services.AddScoped<IUomConverter, UomConverter>();
 builder.Services.AddScoped<IFifoCostingService, FifoCostingService>();
 builder.Services.AddScoped<IStockService, StockService>();
 builder.Services.AddScoped<IGrnService, GrnService>();
 
+// Sales (Phase 1)
+builder.Services.AddScoped<ISalesPricingService, SalesPricingService>();
+builder.Services.AddScoped<ISalesDomainService, SalesDomainService>();
+builder.Services.AddScoped<ISalesPostingService, SalesPostingService>();
+builder.Services.AddScoped<ISalesDocumentWorkflowService, SalesDocumentWorkflowService>();
+builder.Services.AddScoped<ISalesMappingService, SalesMappingService>();
+builder.Services.AddScoped<ISalesInvoiceService, SalesInvoiceService>();
+builder.Services.AddScoped<ISalesSlipService, SalesSlipService>();
+builder.Services.AddScoped<IBundleSaleService, BundleSaleService>();
+builder.Services.AddScoped<ISalesPromotionSuggestionService, SalesPromotionSuggestionService>();
+builder.Services.AddScoped<ISalesReportService, SalesReportService>();
+
 // Stock transactions + reference data (docs/11 §5–6)
 builder.Services.AddScoped<IStockMutator, StockMutator>();
 builder.Services.AddScoped<IReasonCodeService, ReasonCodeService>();
@@ -136,12 +167,22 @@ builder.Services.AddScoped<IPayslipService, PayslipService>();
 // HRM: Reports (docs/13-BACKEND-HRM-API.md §6) — read-only, no new entities
 builder.Services.AddScoped<IHrReportService, HrReportService>();
 
+// Manufacturing / Production Lines (docs/30-BACKEND-PHASE2.md Part A). Templates stand
+// alone; runs consume FifoCostingService for all stock movement. ProductionGraphValidator
+// is deliberately unregistered — it is a pure static algorithm, not an injected service.
+builder.Services.AddScoped<IProductionTemplateService, ProductionTemplateService>();
+builder.Services.AddScoped<IProductionRunService, ProductionRunService>();
+
 // Health checks (EF Core DB)
 builder.Services.AddHealthChecks().AddDbContextCheck<ErpDbContext>();
 
 // Swagger / OpenAPI (Swashbuckle v10 → OpenAPI 3.1)
 builder.Services.AddEndpointsApiExplorer();
-builder.Services.AddSwaggerGen(o => o.SwaggerDoc("v1", new OpenApiInfo { Title = "ERPCore API", Version = "v1" }));
+builder.Services.AddSwaggerGen(o =>
+{
+    o.SwaggerDoc("v1", new OpenApiInfo { Title = "ERPCore API", Version = "v1" });
+    o.CustomSchemaIds(t => t.FullName!.Replace("+", "."));
+});
 
 var app = builder.Build();
 
@@ -149,7 +190,16 @@ var app = builder.Build();
 using (var scope = app.Services.CreateScope())
 {
     var db = scope.ServiceProvider.GetRequiredService<ErpDbContext>();
-    await DataSeeder.SeedAsync(db);
+   // await EnsureMigrationBaselineAsync(db);
+    await db.Database.MigrateAsync();
+    try
+    {
+        await DataSeeder.SeedAsync(db);
+    }
+    catch (Exception ex)
+    {
+        throw new InvalidOperationException("Database migration succeeded, but startup seeding failed.", ex);
+    }
 }
 
 app.UseSerilogRequestLogging();
@@ -166,3 +216,4 @@ app.UseAuthorization();
 app.MapControllers();
 app.MapHealthChecks("/health");
 app.Run();
+

Backend/ERPCore/Services/BundleSaleService.cs

@@ -0,0 +1,263 @@
+using ERPCore.Domain;
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Sales;
+using ERPCore.Infra.Auth;
+using ERPCore.Infra.UoW;
+using ERPCore.Repositories.Interfaces;
+using ERPCore.Services.Interfaces;
+using ERPCore.Services.Stock;
+using ERPCore.System.Errors;
+using Microsoft.EntityFrameworkCore;
+
+namespace ERPCore.Services;
+
+public sealed class BundleSaleService : IBundleSaleService
+{
+    private readonly IRepository<BundleSaleTemplate> _templates;
+    private readonly IRepository<BundleSale> _bundles;
+    private readonly IRepository<Customer> _customers;
+    private readonly IRepository<Item> _items;
+    private readonly IRepository<Uom> _uoms;
+    private readonly IRepository<Warehouse> _warehouses;
+    private readonly IRepository<User> _users;
+    private readonly ISalesDomainService _sales;
+    private readonly IUomConverter _uomConverter;
+    private readonly ISalesPostingService _posting;
+    private readonly ICurrentUser _currentUser;
+    private readonly INumberSequenceService _numbers;
+    private readonly IUnitOfWork _uow;
+
+    public BundleSaleService(
+        IRepository<BundleSale> bundles,
+        IRepository<BundleSaleTemplate> templates,
+        IRepository<Customer> customers,
+        IRepository<Item> items,
+        IRepository<Uom> uoms,
+        IRepository<Warehouse> warehouses,
+        IRepository<User> users,
+        ISalesDomainService sales,
+        IUomConverter uomConverter,
+        ISalesPostingService posting,
+        ICurrentUser currentUser,
+        INumberSequenceService numbers,
+        IUnitOfWork uow)
+    {
+        _templates = templates;
+        _bundles = bundles;
+        _customers = customers;
+        _items = items;
+        _uoms = uoms;
+        _warehouses = warehouses;
+        _users = users;
+        _sales = sales;
+        _uomConverter = uomConverter;
+        _posting = posting;
+        _currentUser = currentUser;
+        _numbers = numbers;
+        _uow = uow;
+    }
+
+    public async Task<PagedResponse<BundleSaleTemplateSummaryDto>> ListTemplatesAsync(PageQuery query, CancellationToken ct = default)
+    {
+        IQueryable<BundleSaleTemplate> q = _templates.Query().AsNoTracking().Include(x => x.Lines);
+        if (!string.IsNullOrWhiteSpace(query.Q))
+        {
+            var term = query.Q.Trim();
+            q = q.Where(x => EF.Functions.ILike(x.TemplateCode, $"%{term}%") || EF.Functions.ILike(x.TemplateName, $"%{term}%") || EF.Functions.ILike(x.Description ?? "", $"%{term}%"));
+        }
+        var total = await q.CountAsync(ct);
+        var rows = await q.OrderByDescending(x => x.BundleSaleTemplateId).Skip(query.Skip).Take(query.PageSize).ToListAsync(ct);
+        return PagedResponse<BundleSaleTemplateSummaryDto>.Create(rows.Select(x => new BundleSaleTemplateSummaryDto(
+            x.BundleSaleTemplateId, x.TemplateCode, x.TemplateName, x.Description, x.Status, x.Lines.Count, x.CreatedAt, x.UpdatedAt)).ToList(), query.Page, query.PageSize, total);
+    }
+
+    public async Task<BundleSaleTemplateDto?> GetTemplateAsync(int bundleSaleTemplateId, CancellationToken ct = default)
+    {
+        var template = await _templates.Query().AsNoTracking().Include(x => x.Lines).FirstOrDefaultAsync(x => x.BundleSaleTemplateId == bundleSaleTemplateId, ct);
+        return template is null ? null : new BundleSaleTemplateDto(
+            template.BundleSaleTemplateId,
+            template.TemplateCode,
+            template.TemplateName,
+            template.Description,
+            template.Status,
+            template.CreatedAt,
+            template.UpdatedAt,
+            template.Lines.OrderBy(x => x.SortOrder).Select(x => new BundleSaleTemplateLineDto(
+                x.BundleSaleTemplateLineId, x.ItemId, x.UomId, x.WarehouseId, x.Qty, x.UnitPrice, x.IncludeInBundle, x.SortOrder)).ToList());
+    }
+
+    public async Task<PagedResponse<BundleSaleSummaryDto>> ListAsync(PageQuery query, BundleSaleStatus? status, int? customerId, int? warehouseId, CancellationToken ct = default)
+    {
+        IQueryable<BundleSale> q = _bundles.Query().AsNoTracking().Include(x => x.Lines);
+        if (!string.IsNullOrWhiteSpace(query.Q))
+        {
+            var term = query.Q.Trim();
+            q = q.Where(x => EF.Functions.ILike(x.BundleNo, $"%{term}%") || EF.Functions.ILike(x.BundleName, $"%{term}%") || EF.Functions.ILike(x.BundleCode, $"%{term}%"));
+        }
+        if (status is not null) q = q.Where(x => x.Status == status);
+        if (customerId is not null) q = q.Where(x => x.CustomerId == customerId);
+        if (warehouseId is not null) q = q.Where(x => x.WarehouseId == warehouseId);
+        var total = await q.CountAsync(ct);
+        var rows = await q.OrderByDescending(x => x.BundleSaleId).Skip(query.Skip).Take(query.PageSize).ToListAsync(ct);
+        return PagedResponse<BundleSaleSummaryDto>.Create(rows.Select(MapSummary).ToList(), query.Page, query.PageSize, total);
+    }
+
+    public async Task<BundleSaleDto?> GetAsync(int bundleSaleId, CancellationToken ct = default)
+    {
+        var bundle = await _bundles.Query().AsNoTracking().Include(x => x.Lines).FirstOrDefaultAsync(x => x.BundleSaleId == bundleSaleId, ct);
+        return bundle is null ? null : Map(bundle);
+    }
+
+    public Task<BundleSalePostingCheckDto> CheckPostingAsync(int bundleSaleId, CancellationToken ct = default)
+        => _posting.CheckBundleAsync(bundleSaleId, ct);
+
+    public async Task<BundleSaleDto> CreateAsync(CreateBundleSaleRequest request, CancellationToken ct = default)
+    {
+        await _sales.ValidateSalesHeaderAsync(request.CustomerId, request.WarehouseId, request.CashierUserId, true, ct);
+        var template = await _templates.Query().AsNoTracking().Include(x => x.Lines)
+            .FirstAsync(x => x.BundleSaleTemplateId == request.BundleSaleTemplateId, ct);
+        var bundle = new BundleSale
+        {
+            BundleNo = await _numbers.NextAsync(DocumentTypes.BundleSale, ct),
+            BundleDate = DateTime.UtcNow,
+            CustomerId = request.CustomerId,
+            WarehouseId = request.WarehouseId,
+            CashierUserId = request.CashierUserId,
+            BundleSaleTemplateId = request.BundleSaleTemplateId,
+            BundleName = request.BundleName,
+            BundleCode = string.Empty,
+            Status = BundleSaleStatus.Draft,
+            CreatedAt = DateTime.UtcNow
+        };
+        bundle.CustomerSnapshotName = await _customers.Query().Where(x => x.CustomerId == request.CustomerId).Select(x => x.DisplayName ?? x.Name).FirstAsync(ct);
+        bundle.Lines = await BuildLinesAsync(template, request.WarehouseId, request.Lines, ct);
+        Recalculate(bundle, request.BundlePrice);
+        bundle.BundleCode = $"{bundle.BundleNo}-B";
+        await _bundles.AddAsync(bundle, ct);
+        bundle.ConcurrencyStamp = 1;
+        await _uow.SaveChangesAsync(ct);
+        return Map(bundle);
+    }
+
+    public async Task<BundleSaleDto> UpdateAsync(int bundleSaleId, UpdateBundleSaleRequest request, CancellationToken ct = default)
+    {
+        var bundle = await _bundles.Query().Include(x => x.Lines).FirstOrDefaultAsync(x => x.BundleSaleId == bundleSaleId, ct)
+            ?? throw new NotFoundException($"Bundle sale {bundleSaleId} was not found.");
+        if (bundle.Status != BundleSaleStatus.Draft)
+            throw new ConflictException($"Bundle sale {bundleSaleId} is {bundle.Status} and cannot be edited.");
+
+        await _sales.ValidateSalesHeaderAsync(request.CustomerId, request.WarehouseId, request.CashierUserId, true, ct);
+        var template = await _templates.Query().AsNoTracking().Include(x => x.Lines)
+            .FirstAsync(x => x.BundleSaleTemplateId == request.BundleSaleTemplateId, ct);
+        bundle.CustomerId = request.CustomerId;
+        bundle.WarehouseId = request.WarehouseId;
+        bundle.CashierUserId = request.CashierUserId;
+        bundle.BundleSaleTemplateId = request.BundleSaleTemplateId;
+        bundle.BundleName = request.BundleName;
+        bundle.CustomerSnapshotName = await _customers.Query().Where(x => x.CustomerId == request.CustomerId).Select(x => x.DisplayName ?? x.Name).FirstAsync(ct);
+        bundle.Lines.Clear();
+        foreach (var line in await BuildLinesAsync(template, request.WarehouseId, request.Lines, ct)) bundle.Lines.Add(line);
+        Recalculate(bundle, request.BundlePrice);
+        bundle.UpdatedAt = DateTime.UtcNow;
+        bundle.ConcurrencyStamp++;
+        await _uow.SaveChangesAsync(ct);
+        return Map(bundle);
+    }
+
+    public async Task<BundleSaleDto> PostAsync(int bundleSaleId, CancellationToken ct = default)
+        {
+            await _posting.PostBundleAsync(bundleSaleId, ct);
+            var bundle = await _bundles.Query().AsNoTracking().Include(x => x.Lines)
+                .FirstAsync(x => x.BundleSaleId == bundleSaleId, ct);
+            return Map(bundle);
+        }
+
+    public async Task<BundleSaleDto> CancelAsync(int bundleSaleId, CancellationToken ct = default)
+    {
+        var bundle = await _bundles.Query().Include(x => x.Lines).FirstOrDefaultAsync(x => x.BundleSaleId == bundleSaleId, ct)
+            ?? throw new NotFoundException($"Bundle sale {bundleSaleId} was not found.");
+        if (bundle.Status != BundleSaleStatus.Draft)
+            throw new ConflictException($"Bundle sale {bundleSaleId} is {bundle.Status} and cannot be cancelled.");
+        bundle.Status = BundleSaleStatus.Cancelled;
+        bundle.UpdatedAt = DateTime.UtcNow;
+        bundle.ConcurrencyStamp++;
+        await _uow.SaveChangesAsync(ct);
+        return Map(bundle);
+    }
+
+    private async Task<List<BundleSaleLine>> BuildLinesAsync(
+        BundleSaleTemplate template, int warehouseId, IReadOnlyList<CreateBundleSaleTemplateLineRequest> requestLines, CancellationToken ct)
+    {
+        var lines = new List<BundleSaleLine>();
+        var sourceLines = requestLines.Count > 0
+            ? requestLines.OrderBy(x => x.SortOrder).ToList()
+            : template.Lines.OrderBy(x => x.SortOrder).Select(x => new CreateBundleSaleTemplateLineRequest
+            {
+                ItemId = x.ItemId,
+                UomId = x.UomId,
+                WarehouseId = x.WarehouseId,
+                Qty = x.Qty,
+                UnitPrice = x.UnitPrice,
+                IncludeInBundle = x.IncludeInBundle,
+                SortOrder = x.SortOrder
+            }).ToList();
+
+        foreach (var r in sourceLines)
+        {
+            if (r.Qty <= 0)
+                throw new DomainException(ErrorCodes.Validation, "Bundle line quantity must be greater than zero.", 422);
+
+            // Bundle sales use the header warehouse as the source of truth for stock and pricing.
+            // Keep any per-line warehouse input from drifting away from the header.
+            var lineWarehouseId = warehouseId;
+
+            var item = await _items.Query().AsNoTracking().FirstAsync(x => x.ItemId == r.ItemId, ct);
+            await _sales.ValidateSalesLineAsync(warehouseId, r.ItemId, r.UomId, lineWarehouseId, r.Qty, 0m, null, ct);
+
+            // Keep the entered UOM on the line and snapshot the base quantity beside it, the
+            // same shape as invoices and slips. Qty and UnitPrice stay a matching pair in the
+            // entered UOM so LineTotal — which Recalculate rolls into the header — is the
+            // value the user priced; only QtyBase crosses into the base-UOM stock engine.
+            var factor = await _uomConverter.ResolveFactorAsync(item, r.UomId, ct);
+            var calc = _sales.ComputeLine(r.Qty, 0m, r.UnitPrice, SalesDiscountMode.Amount, 0m, 0m, 0m, 0m, false);
+            lines.Add(new BundleSaleLine
+            {
+                ItemId = r.ItemId,
+                Description = item.Name,
+                Qty = r.Qty,
+                UomId = r.UomId,
+                QtyBase = UomConverter.ApplyFactor(r.Qty, factor),
+                ConversionFactor = factor,
+                WarehouseId = lineWarehouseId,
+                UnitPrice = r.UnitPrice,
+                LineTotal = calc.LineTotal,
+                IncludeInBundle = r.IncludeInBundle,
+                IsComponent = true,
+                ParentLineId = null
+            });
+        }
+        return lines;
+    }
+
+    private static void Recalculate(BundleSale bundle, decimal bundlePrice)
+    {
+        bundle.ComponentSubtotal = bundle.Lines.Where(x => x.IncludeInBundle).Sum(x => x.LineTotal);
+        bundle.BundlePrice = bundlePrice;
+        bundle.MarginAmount = bundle.BundlePrice - bundle.ComponentSubtotal;
+        bundle.DiscountTotal = Math.Max(0m, bundle.ComponentSubtotal - bundle.BundlePrice);
+        bundle.TaxTotal = 0m;
+        bundle.GrandTotal = bundle.BundlePrice + bundle.TaxTotal;
+    }
+
+    private static BundleSaleSummaryDto MapSummary(BundleSale x) => new(
+        x.BundleSaleId, x.BundleNo, x.BundleDate, x.CustomerId, x.CustomerSnapshotName, x.WarehouseId, x.BundleName, x.BundleCode, x.Status, x.ComponentSubtotal, x.BundlePrice, x.GrandTotal, x.CreatedAt);
+
+    private static BundleSaleDto Map(BundleSale x) => new(
+        x.BundleSaleId, x.BundleNo, x.BundleDate, x.CustomerId, x.CustomerSnapshotName, x.WarehouseId, x.CashierUserId, x.BundleSaleTemplateId,
+        x.BundleName, x.BundleCode, x.Status, x.ComponentSubtotal, x.BundlePrice, x.MarginAmount, x.DiscountTotal, x.TaxTotal, x.GrandTotal,
+        x.CreatedAt, x.UpdatedAt,
+        x.Lines.Select(l => new BundleSaleLineDto(l.BundleSaleLineId, l.ItemId, l.Description, l.Qty, l.UomId, l.WarehouseId, l.UnitPrice, l.LineTotal, l.IncludeInBundle, l.IsComponent, l.ParentLineId)).ToList());
+
+}

Backend/ERPCore/Services/CustomerService.cs

@@ -0,0 +1,168 @@
+using ERPCore.Common.Http;
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Customers;
+using ERPCore.Infra.UoW;
+using ERPCore.Repositories.Interfaces;
+using ERPCore.Services.Interfaces;
+using ERPCore.System.Errors;
+using Microsoft.EntityFrameworkCore;
+
+namespace ERPCore.Services;
+
+public sealed class CustomerService : ICustomerService
+{
+    private readonly IRepository<Customer> _customers;
+    private readonly IRepository<Warehouse> _warehouses;
+    private readonly IUnitOfWork _uow;
+
+    public CustomerService(IRepository<Customer> customers, IRepository<Warehouse> warehouses, IUnitOfWork uow)
+    {
+        _customers = customers;
+        _warehouses = warehouses;
+        _uow = uow;
+    }
+
+    public async Task<PagedResponse<CustomerDto>> ListAsync(PageQuery query, EntityStatus? status, CustomerType? customerType, CancellationToken ct = default)
+    {
+        var q = _customers.Query().AsNoTracking();
+        if (!string.IsNullOrWhiteSpace(query.Q))
+        {
+            var term = query.Q.Trim();
+            q = q.Where(c => EF.Functions.ILike(c.Name, $"%{term}%")
+                             || EF.Functions.ILike(c.CustomerCode, $"%{term}%")
+                             || (c.DisplayName != null && EF.Functions.ILike(c.DisplayName, $"%{term}%")));
+        }
+        if (status is not null) q = q.Where(c => c.Status == status);
+        if (customerType is not null) q = q.Where(c => c.CustomerType == customerType);
+
+        var total = await q.CountAsync(ct);
+        var rows = await q.OrderBy(c => c.Name)
+            .Skip(query.Skip).Take(query.PageSize)
+            .Select(c => new CustomerDto(
+                c.CustomerId, c.CustomerCode, c.CustomerType, c.Name, c.DisplayName, c.Phone, c.Email,
+                c.AddressLine1, c.AddressLine2, c.City, c.Country, c.TaxRegistrationNo,
+                c.CreditLimit, c.CreditDays, c.DefaultWarehouseId, c.Status, c.CreatedAt, c.UpdatedAt))
+            .ToListAsync(ct);
+
+        return PagedResponse<CustomerDto>.Create(rows, query.Page, query.PageSize, total);
+    }
+
+    public async Task<ETagged<CustomerDto>?> GetAsync(int customerId, CancellationToken ct = default)
+    {
+        var customer = await _customers.Query().AsNoTracking()
+            .FirstOrDefaultAsync(c => c.CustomerId == customerId, ct);
+        return customer is null ? null : new ETagged<CustomerDto>(Map(customer), customer.RowVersion);
+    }
+
+    public async Task<ETagged<CustomerDto>> CreateAsync(CreateCustomerRequest request, CancellationToken ct = default)
+    {
+        var code = request.CustomerCode.Trim();
+        var name = request.Name.Trim();
+
+        if (await _customers.Query().AnyAsync(c => c.CustomerCode.ToLower() == code.ToLower(), ct))
+            throw new ConflictException($"A customer code '{code}' already exists.");
+
+        if (!string.IsNullOrWhiteSpace(request.Email))
+        {
+            var email = request.Email.Trim();
+            if (await _customers.Query().AnyAsync(c => c.Email != null && c.Email.ToLower() == email.ToLower(), ct))
+                throw new ConflictException($"A customer with email '{email}' already exists.");
+        }
+
+        if (request.DefaultWarehouseId is not null)
+        {
+            var exists = await _warehouses.Query().AnyAsync(w => w.WarehouseId == request.DefaultWarehouseId, ct);
+            if (!exists) throw new NotFoundException($"Warehouse {request.DefaultWarehouseId} was not found.");
+        }
+
+        var customer = new Customer
+        {
+            CustomerCode = code,
+            CustomerType = request.CustomerType,
+            Name = name,
+            DisplayName = Normalize(request.DisplayName),
+            Phone = Normalize(request.Phone),
+            Email = Normalize(request.Email),
+            AddressLine1 = Normalize(request.AddressLine1),
+            AddressLine2 = Normalize(request.AddressLine2),
+            City = Normalize(request.City),
+            Country = Normalize(request.Country),
+            TaxRegistrationNo = Normalize(request.TaxRegistrationNo),
+            CreditLimit = request.CreditLimit,
+            CreditDays = request.CreditDays,
+            DefaultWarehouseId = request.DefaultWarehouseId,
+            Status = EntityStatus.Active,
+            CreatedAt = DateTime.UtcNow
+        };
+
+        await _customers.AddAsync(customer, ct);
+        await _uow.SaveChangesAsync(ct);
+
+        return new ETagged<CustomerDto>(Map(customer), customer.RowVersion);
+    }
+
+    public async Task<ETagged<CustomerDto>> UpdateAsync(int customerId, UpdateCustomerRequest request, uint expectedRowVersion, CancellationToken ct = default)
+    {
+        var customer = await _customers.GetByIdAsync(customerId, ct)
+            ?? throw new NotFoundException($"Customer {customerId} was not found.");
+
+        if (customer.RowVersion != expectedRowVersion)
+            throw new DomainException(ErrorCodes.ConcurrencyConflict, "The customer was modified by another request.", 412);
+
+        var code = request.CustomerCode.Trim();
+        var name = request.Name.Trim();
+
+        if (!string.Equals(customer.CustomerCode, code, StringComparison.Ordinal)
+            && await _customers.Query().AnyAsync(c => c.CustomerCode.ToLower() == code.ToLower() && c.CustomerId != customerId, ct))
+            throw new ConflictException($"A customer code '{code}' already exists.");
+
+        if (!string.Equals(customer.Email, request.Email?.Trim(), StringComparison.OrdinalIgnoreCase)
+            && !string.IsNullOrWhiteSpace(request.Email)
+            && await _customers.Query().AnyAsync(c => c.Email != null && c.Email.ToLower() == request.Email!.Trim().ToLower() && c.CustomerId != customerId, ct))
+            throw new ConflictException($"A customer with email '{request.Email.Trim()}' already exists.");
+
+        if (request.DefaultWarehouseId is not null)
+        {
+            var exists = await _warehouses.Query().AnyAsync(w => w.WarehouseId == request.DefaultWarehouseId, ct);
+            if (!exists) throw new NotFoundException($"Warehouse {request.DefaultWarehouseId} was not found.");
+        }
+
+        customer.CustomerCode = code;
+        customer.CustomerType = request.CustomerType;
+        customer.Name = name;
+        customer.DisplayName = Normalize(request.DisplayName);
+        customer.Phone = Normalize(request.Phone);
+        customer.Email = Normalize(request.Email);
+        customer.AddressLine1 = Normalize(request.AddressLine1);
+        customer.AddressLine2 = Normalize(request.AddressLine2);
+        customer.City = Normalize(request.City);
+        customer.Country = Normalize(request.Country);
+        customer.TaxRegistrationNo = Normalize(request.TaxRegistrationNo);
+        customer.CreditLimit = request.CreditLimit;
+        customer.CreditDays = request.CreditDays;
+        customer.DefaultWarehouseId = request.DefaultWarehouseId;
+        customer.UpdatedAt = DateTime.UtcNow;
+
+        await _uow.SaveChangesAsync(ct);
+        return new ETagged<CustomerDto>(Map(customer), customer.RowVersion);
+    }
+
+    public async Task SetStatusAsync(int customerId, EntityStatus status, CancellationToken ct = default)
+    {
+        var customer = await _customers.GetByIdAsync(customerId, ct)
+            ?? throw new NotFoundException($"Customer {customerId} was not found.");
+
+        customer.Status = status;
+        customer.UpdatedAt = DateTime.UtcNow;
+        await _uow.SaveChangesAsync(ct);
+    }
+
+    private static CustomerDto Map(Customer c) => new(
+        c.CustomerId, c.CustomerCode, c.CustomerType, c.Name, c.DisplayName, c.Phone, c.Email,
+        c.AddressLine1, c.AddressLine2, c.City, c.Country, c.TaxRegistrationNo,
+        c.CreditLimit, c.CreditDays, c.DefaultWarehouseId, c.Status, c.CreatedAt, c.UpdatedAt);
+
+    private static string? Normalize(string? value) => string.IsNullOrWhiteSpace(value) ? null : value.Trim();
+}

Backend/ERPCore/Services/GeneralLedgerService.cs

@@ -0,0 +1,16 @@
+using ERPCore.Infra.Gl;
+using ERPCore.Services.Interfaces;
+
+namespace ERPCore.Services;
+
+/// <inheritdoc cref="IGeneralLedgerService"/>
+public sealed class GeneralLedgerService : IGeneralLedgerService
+{
+    private readonly IGeneralLedgerClient _client;
+
+    public GeneralLedgerService(IGeneralLedgerClient client) => _client = client;
+
+    public Task<GeneralLedgerResponse> ForwardAsync(
+        HttpMethod method, string path, string? queryString, string? contentType, Stream? body, CancellationToken ct)
+        => _client.SendAsync(method, path, queryString, contentType, body, ct);
+}

Backend/ERPCore/Services/GrnService.cs

@@ -7,6 +7,7 @@ using ERPCore.Infra.Auth;
 using ERPCore.Infra.UoW;
 using ERPCore.Repositories.Interfaces;
 using ERPCore.Services.Interfaces;
+using ERPCore.Services.Stock;
 using ERPCore.System.Errors;
 using Microsoft.EntityFrameworkCore;
 
@@ -33,9 +34,9 @@ public sealed class GrnService : IGrnService
     private readonly IRepository<Bin> _bins;
     private readonly IRepository<Vendor> _vendors;
     private readonly IRepository<Batch> _batches;
-    private readonly IRepository<UomConversion> _conversions;
     private readonly IRepository<StockLayer> _layers;
     private readonly IRepository<StockLedger> _ledger;
+    private readonly IUomConverter _uomConverter;
     private readonly IFifoCostingService _fifo;
     private readonly INumberSequenceService _numbers;
     private readonly ICurrentUser _currentUser;
@@ -45,7 +46,7 @@ public sealed class GrnService : IGrnService
         IRepository<Grn> grns, IRepository<PurchaseOrder> pos, IRepository<PoLine> poLines,
         IRepository<Item> items, IRepository<Uom> uoms, IRepository<Warehouse> warehouses,
         IRepository<Bin> bins, IRepository<Vendor> vendors, IRepository<Batch> batches,
-        IRepository<UomConversion> conversions, IRepository<StockLayer> layers, IRepository<StockLedger> ledger,
+        IRepository<StockLayer> layers, IRepository<StockLedger> ledger, IUomConverter uomConverter,
         IFifoCostingService fifo, INumberSequenceService numbers, ICurrentUser currentUser, IUnitOfWork uow)
     {
         _grns = grns;
@@ -57,9 +58,9 @@ public sealed class GrnService : IGrnService
         _bins = bins;
         _vendors = vendors;
         _batches = batches;
-        _conversions = conversions;
         _layers = layers;
         _ledger = ledger;
+        _uomConverter = uomConverter;
         _fifo = fifo;
         _numbers = numbers;
         _currentUser = currentUser;
@@ -138,6 +139,12 @@ public sealed class GrnService : IGrnService
             if (input.BinId is not null && !await _bins.Query().AnyAsync(b => b.BinId == input.BinId && b.WarehouseId == request.WarehouseId, ct))
                 throw new DomainException(ErrorCodes.Validation, $"Bin {input.BinId} is not in warehouse {request.WarehouseId}.", 422);
 
+            // Resolve the base quantity at entry. This rejects a UOM the item cannot be
+            // received in while the GRN is still a draft, and snapshots the factor so confirm
+            // (and any later reversal) reproduces exactly this quantity.
+            var conversionFactor = await _uomConverter.ResolveFactorAsync(item, input.UomId, ct);
+            var qtyBaseEntered = UomConverter.ApplyFactor(input.Qty, conversionFactor);
+
             // Cost: for a PO line, the PO price is used unless an override is entered (then it
             // wins and a variance is recorded against the PO snapshot — docs/02-SECURITY C.3,
             // revised). Direct receipts always use the entered cost.
@@ -150,10 +157,13 @@ public sealed class GrnService : IGrnService
                 if (poLine.ItemId != input.ItemId)
                     throw new DomainException(ErrorCodes.Validation, $"PO line {input.PoLineId} is for a different item.", 422);
 
-                var openQty = poLine.Qty - poLine.QtyReceived;
-                if (input.Qty > openQty * (1 + OverReceiptTolerance))
+                // Compare in base UOM: a GRN may legitimately receive in a different UOM from
+                // the one the PO was raised in (10 BOX ordered, 120 PCS delivered), and
+                // comparing the two raw numbers would reject that valid receipt.
+                var openQtyBase = poLine.QtyBase - poLine.QtyReceivedBase;
+                if (qtyBaseEntered > openQtyBase * (1 + OverReceiptTolerance))
                     throw new DomainException(ErrorCodes.OverReceiptTolerance,
-                        $"Receiving {input.Qty} exceeds the open quantity {openQty} on PO line {input.PoLineId}.", 422);
+                        $"Receiving {input.Qty} ({qtyBaseEntered} base) exceeds the open quantity {openQtyBase} base on PO line {input.PoLineId}.", 422);
 
                 poUnitPrice = poLine.UnitPrice;
                 unitCost = input.UnitCost > 0 ? input.UnitCost : poLine.UnitPrice;
@@ -178,6 +188,8 @@ public sealed class GrnService : IGrnService
                 BinId = input.BinId,
                 Batch = batch, // navigation so EF fixes up BatchId once the batch is inserted
                 Qty = input.Qty,
+                QtyBase = qtyBaseEntered,
+                ConversionFactor = conversionFactor,
                 UnitCost = unitCost,
                 PoUnitPrice = poUnitPrice,
                 DiscountPct = input.DiscountPct,
@@ -234,10 +246,13 @@ public sealed class GrnService : IGrnService
         {
             foreach (var line in grn.Lines.OrderBy(l => l.GrnLineId))
             {
-                var item = await _items.Query().AsNoTracking().FirstAsync(i => i.ItemId == line.ItemId, token);
                 // FIFO layer costs at the after-discount net price; VAT is recoverable and never
-                // enters stock value (docs/10 FR-GRN-06, revised).
-                var (qtyBase, unitCostBase) = await ToBaseAsync(item, line.UomId, line.Qty, line.NetUnitCost, token);
+                // enters stock value (docs/10 FR-GRN-06, revised). Quantity and cost come from
+                // the factor snapshotted at line creation, not a fresh lookup — see GrnLine.QtyBase.
+                var qtyBase = line.QtyBase;
+                var unitCostBase = line.ConversionFactor == 1m
+                    ? line.NetUnitCost
+                    : Math.Round(line.NetUnitCost / line.ConversionFactor, 6, MidpointRounding.AwayFromZero);
 
                 var layer = await _fifo.CreateInboundLayerAsync(
                     line.ItemId, grn.WarehouseId, line.BatchId, null, line.GrnLineId,
@@ -258,7 +273,13 @@ public sealed class GrnService : IGrnService
                 if (line.PoLineId is not null)
                 {
                     var poLine = await _poLines.GetByIdAsync(line.PoLineId.Value, token);
-                    if (poLine is not null) poLine.QtyReceived += line.Qty;
+                    if (poLine is not null)
+                    {
+                        // Accrue in base so receipts in a UOM other than the PO's still add up.
+                        // QtyReceived is kept in the PO's own UOM for display only.
+                        poLine.QtyReceivedBase += qtyBase;
+                        poLine.QtyReceived = UomConverter.FromBase(poLine.QtyReceivedBase, poLine.ConversionFactor);
+                    }
                 }
             }
 
@@ -345,27 +366,14 @@ public sealed class GrnService : IGrnService
         return created; // linked via GrnLine.Batch navigation; FK fixed up on SaveChanges
     }
 
-    private async Task<(decimal QtyBase, decimal UnitCostBase)> ToBaseAsync(
-        Item item, int uomId, decimal qty, decimal unitCostPerUom, CancellationToken ct)
-    {
-        if (uomId == item.BaseUomId)
-            return (qty, unitCostPerUom);
-
-        var conv = await _conversions.Query().AsNoTracking()
-            .FirstOrDefaultAsync(c => c.ItemId == item.ItemId && c.FromUomId == uomId && c.ToUomId == item.BaseUomId, ct)
-            ?? throw new DomainException(ErrorCodes.Validation,
-                $"No UOM conversion from {uomId} to base UOM {item.BaseUomId} for item {item.ItemId}.", 422);
-
-        return (qty * conv.Factor, unitCostPerUom / conv.Factor);
-    }
-
     private async Task UpdatePoStatusAsync(int? poId, CancellationToken ct)
     {
         if (poId is null) return;
         var po = await _pos.Query().Include(p => p.Lines).FirstOrDefaultAsync(p => p.PoId == poId, ct);
         if (po is null) return;
 
-        po.Status = po.Lines.All(l => l.QtyReceived >= l.Qty)
+        // Base-vs-base: QtyReceived is a denormalized display figure and must not gate closing.
+        po.Status = po.Lines.All(l => l.QtyReceivedBase >= l.QtyBase)
             ? PurchaseOrderStatus.FullyReceived
             : PurchaseOrderStatus.PartiallyReceived;
         po.UpdatedAt = DateTime.UtcNow;

Backend/ERPCore/Services/Interfaces/IBundleSaleService.cs

@@ -0,0 +1,19 @@
+using ERPCore.Common.Http;
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Sales;
+
+namespace ERPCore.Services.Interfaces;
+
+public interface IBundleSaleService
+{
+    Task<PagedResponse<BundleSaleTemplateSummaryDto>> ListTemplatesAsync(PageQuery query, CancellationToken ct = default);
+    Task<BundleSaleTemplateDto?> GetTemplateAsync(int bundleSaleTemplateId, CancellationToken ct = default);
+    Task<PagedResponse<BundleSaleSummaryDto>> ListAsync(PageQuery query, BundleSaleStatus? status, int? customerId, int? warehouseId, CancellationToken ct = default);
+    Task<BundleSaleDto?> GetAsync(int bundleSaleId, CancellationToken ct = default);
+    Task<BundleSalePostingCheckDto> CheckPostingAsync(int bundleSaleId, CancellationToken ct = default);
+    Task<BundleSaleDto> CreateAsync(CreateBundleSaleRequest request, CancellationToken ct = default);
+    Task<BundleSaleDto> UpdateAsync(int bundleSaleId, UpdateBundleSaleRequest request, CancellationToken ct = default);
+    Task<BundleSaleDto> PostAsync(int bundleSaleId, CancellationToken ct = default);
+    Task<BundleSaleDto> CancelAsync(int bundleSaleId, CancellationToken ct = default);
+}

Backend/ERPCore/Services/Interfaces/ICustomerService.cs

@@ -0,0 +1,15 @@
+using ERPCore.Common.Http;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Customers;
+using ERPCore.Domain.Enums;
+
+namespace ERPCore.Services.Interfaces;
+
+public interface ICustomerService
+{
+    Task<PagedResponse<CustomerDto>> ListAsync(PageQuery query, EntityStatus? status, CustomerType? customerType, CancellationToken ct = default);
+    Task<ETagged<CustomerDto>?> GetAsync(int customerId, CancellationToken ct = default);
+    Task<ETagged<CustomerDto>> CreateAsync(CreateCustomerRequest request, CancellationToken ct = default);
+    Task<ETagged<CustomerDto>> UpdateAsync(int customerId, UpdateCustomerRequest request, uint expectedRowVersion, CancellationToken ct = default);
+    Task SetStatusAsync(int customerId, EntityStatus status, CancellationToken ct = default);
+}

Backend/ERPCore/Services/Interfaces/IFifoCostingService.cs

@@ -29,11 +29,22 @@ public interface IFifoCostingService
     Task<IReadOnlyList<ConsumedSegment>> ConsumeAsync(
         int itemId, int warehouseId, int? batchId, decimal qtyBase, CancellationToken ct = default);
 
-    /// <summary>Append an immutable ledger entry (value = qtyBase × unitCost).</summary>
+    /// <summary>
+    /// Append an immutable ledger entry. Value defaults to <c>round(qtyBase × unitCost, 4)</c>.
+    /// </summary>
+    /// <param name="valueOverride">
+    /// Posts this exact value instead of deriving it from qty × unit cost. Needed when the
+    /// authoritative figure is a total rather than a rate: a production receipt must carry the
+    /// run's cost pool exactly, but <c>unitCost = pool / goodQty</c> rounds to 6 dp, and at
+    /// 100+ units that rounding error exceeds the ledger's 4 dp tick — so the derived value
+    /// would drift from the pool (FR-MFG-13). Also used by leftover and cancel returns, whose
+    /// value is the exact consumed residual. Omit for every rate-driven movement.
+    /// </param>
     Task<StockLedger> PostLedgerAsync(
         int itemId, int warehouseId, int? binId, int? batchId, int? serialId, int userId,
         Direction direction, decimal qtyBase, decimal unitCost, decimal runningBalance,
-        string sourceDocType, int sourceDocId, DateTime createdAt, CancellationToken ct = default);
+        string sourceDocType, int sourceDocId, DateTime createdAt, CancellationToken ct = default,
+        decimal? valueOverride = null);
 
     /// <summary>Current on-hand (Σ open-layer qtyRemaining) for an item at a warehouse.</summary>
     Task<decimal> GetOnHandAsync(int itemId, int warehouseId, CancellationToken ct = default);

Backend/ERPCore/Services/Interfaces/IGeneralLedgerService.cs

@@ -0,0 +1,16 @@
+using ERPCore.Infra.Gl;
+
+namespace ERPCore.Services.Interfaces;
+
+/// <summary>
+/// Single entry point into the external General Ledger service — the one function
+/// used both by <see cref="ERPCore.Controllers.GeneralLedgerController"/> (frontend
+/// requests, forwarded verbatim) and, once wired, other ERPCore services that need to
+/// post directly to GL (e.g. GRN confirm, adjustments — docs/12-GENERAL-LEDGER-INTEGRATION.md).
+/// No business logic lives here yet; this pass only connects the transport.
+/// </summary>
+public interface IGeneralLedgerService
+{
+    Task<GeneralLedgerResponse> ForwardAsync(
+        HttpMethod method, string path, string? queryString, string? contentType, Stream? body, CancellationToken ct);
+}

Backend/ERPCore/Services/Interfaces/IProductionRunService.cs

@@ -0,0 +1,99 @@
+using ERPCore.Common.Http;
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Production;
+
+namespace ERPCore.Services.Interfaces;
+
+/// <summary>
+/// Production run lifecycle (docs/30 §D.2–D.3, FR-MFG-08..19). Every stock-affecting
+/// action runs inside a single <c>ExecuteInTransactionAsync</c> scope and consumes stock
+/// only through <c>IFifoCostingService</c> (NFR-02/NFR-05).
+/// </summary>
+public interface IProductionRunService
+{
+    Task<PagedResponse<RunSummaryDto>> ListAsync(
+        PageQuery query, ProductionRunStatus? status, int? templateId, int? warehouseId,
+        CancellationToken ct = default);
+
+    Task<ETagged<RunGraphDto>?> GetAsync(int runId, CancellationToken ct = default);
+
+    /// <summary>
+    /// Instantiates a template (FR-MFG-08): copies every stage, input, output and edge,
+    /// scales all quantities by <c>targetQty / terminalOutputQtyPerBatch</c>, issues a
+    /// <c>PRD-…</c> document number, and leaves entry stages Ready with the rest Waiting.
+    /// </summary>
+    Task<ETagged<RunGraphDto>> CreateAsync(CreateRunRequest request, CancellationToken ct = default);
+
+    /// <summary>
+    /// Per-run quantity override on a stage that has not started
+    /// (<c>409 STAGE_NOT_EDITABLE</c> once it has). Re-evaluates the stage's readiness,
+    /// since raising an upstream input's planned quantity can un-ready it.
+    /// </summary>
+    Task<RunStageDto> UpdateStageQuantitiesAsync(
+        int runId, int runStageId, UpdateStageQuantitiesRequest request, CancellationToken ct = default);
+
+    /// <summary>
+    /// <c>Ready → InProgress</c> (FR-MFG-10). FIFO-consumes every Stock input from the run
+    /// warehouse in one transaction and stamps <c>actualStartAt</c>.
+    /// <para>Consumes <c>max(0, plannedBase − consumedQty)</c> per input, so a rework
+    /// restart with an unchanged planned quantity consumes nothing and one with a raised
+    /// planned quantity consumes only the delta (FR-MFG-16).</para>
+    /// </summary>
+    Task<StartStageResultDto> StartStageAsync(int runId, int runStageId, CancellationToken ct = default);
+
+    /// <summary>
+    /// <c>InProgress → Done</c> (FR-MFG-11). Records produced and scrapped quantities per
+    /// output plus the custom field values. A re-complete after a rework <b>overwrites</b>
+    /// the previous figures rather than adding to them.
+    /// </summary>
+    Task<RunStageDto> CompleteStageAsync(
+        int runId, int runStageId, CompleteStageRequest request, CancellationToken ct = default);
+
+    /// <summary>
+    /// <c>Done → Approved</c> (FR-MFG-12/13). Non-terminal: hands WIP to the children,
+    /// defaulting to the full available quantity. Terminal: posts the production receipt —
+    /// a finished-goods layer costed at <c>costPool / goodQty</c> — and completes the run.
+    /// </summary>
+    Task<ApproveStageResultDto> ApproveStageAsync(
+        int runId, int runStageId, ApproveStageRequest request, CancellationToken ct = default);
+
+    /// <summary>
+    /// Later partial transfer of a remainder held on an already-Approved stage (FR-MFG-12),
+    /// never exceeding produced − scrapped − already transferred.
+    /// </summary>
+    Task<TransferResultDto> TransferAsync(
+        int runId, int runStageId, TransferRemainderRequest request, CancellationToken ct = default);
+
+    /// <summary>
+    /// Returns unconsumed material to stock before the receipt closes the pool (FR-MFG-14).
+    /// The inbound layer is created at the <b>weighted cost actually consumed</b> for that
+    /// input, so the move is cost-preserving and the pool reduces by exactly what leaves it.
+    /// <c>409 RUN_COST_CLOSED</c> once the run has completed.
+    /// </summary>
+    Task<ReturnLeftoverResultDto> ReturnLeftoverAsync(
+        int runId, int runInputId, ReturnLeftoverRequest request, CancellationToken ct = default);
+
+    /// <summary>
+    /// Downstream reject (FR-MFG-15): this stage rejects the work it received, its delivering
+    /// parents revert <c>Approved → InProgress</c> with their transferred quantities pulled
+    /// back, and this stage returns to Waiting. Consumed stock stays consumed.
+    /// </summary>
+    Task<RejectIntakeResultDto> RejectIntakeAsync(
+        int runId, int runStageId, RejectRequest request, CancellationToken ct = default);
+
+    /// <summary>
+    /// Terminal reject (FR-MFG-16): resets the whole run to its starting stages, increments
+    /// <c>reworkCount</c> and snapshots the discarded figures into the event history.
+    /// Already-consumed material remains in the cost pool.
+    /// </summary>
+    Task<TerminalRejectResultDto> RejectTerminalAsync(
+        int runId, int runStageId, RejectRequest request, CancellationToken ct = default);
+
+    /// <summary>
+    /// Cancels an in-progress run (FR-MFG-17). Net consumed-and-not-returned stock goes back
+    /// at its consumed weighted cost; scrapped output quantities are written off on the event.
+    /// <c>409 RUN_NOT_CANCELLABLE</c> for a completed run.
+    /// </summary>
+    Task<CancelRunResultDto> CancelAsync(int runId, CancelRunRequest request, CancellationToken ct = default);
+}

Backend/ERPCore/Services/Interfaces/IProductionTemplateService.cs

@@ -0,0 +1,33 @@
+using ERPCore.Common.Http;
+using ERPCore.Domain.Enums;
+using ERPCore.Dtos.Common;
+using ERPCore.Dtos.Production;
+
+namespace ERPCore.Services.Interfaces;
+
+/// <summary>
+/// Production template CRUD and graph validation (docs/30 §D.1, FR-MFG-01..07).
+/// </summary>
+public interface IProductionTemplateService
+{
+    Task<PagedResponse<TemplateSummaryDto>> ListAsync(PageQuery query, EntityStatus? status, CancellationToken ct = default);
+
+    Task<ETagged<TemplateGraphDto>?> GetAsync(int templateId, CancellationToken ct = default);
+
+    Task<ETagged<TemplateGraphDto>> CreateAsync(SaveTemplateRequest request, CancellationToken ct = default);
+
+    /// <summary>
+    /// Replaces the whole graph. Requires the current row version (<c>If-Match</c>) and is
+    /// refused with <c>409 TEMPLATE_IN_USE</c> while any run of this template is
+    /// InProgress — edit-lock stands in for versioning (FR-MFG-06).
+    /// </summary>
+    Task<ETagged<TemplateGraphDto>> UpdateAsync(
+        int templateId, SaveTemplateRequest request, uint expectedRowVersion, CancellationToken ct = default);
+
+    /// <summary>
+    /// Activate/deactivate (FR-MFG-01). Deliberately <b>not</b> edit-locked: deactivating is
+    /// the "never delete a referenced master" path (FR-MD-08) and only stops <i>new</i> runs
+    /// being started, so it must stay available while runs are in flight.
+    /// </summary>
+    Task SetStatusAsync(int templateId, EntityStatus status, CancellationToken ct = default);
+}