product and sales fixers

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

@@ -0,0 +1,25 @@
+using ERPCore.Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+public sealed class ItemImageConfiguration : IEntityTypeConfiguration<ItemImage>
+{
+    public void Configure(EntityTypeBuilder<ItemImage> builder)
+    {
+        builder.ToTable("item_images");
+        builder.HasKey(i => i.ItemImageId);
+
+        builder.Property(i => i.OriginalFileName).IsRequired().HasMaxLength(260);
+        builder.Property(i => i.StoredFileName).IsRequired().HasMaxLength(260);
+        builder.Property(i => i.RelativePath).IsRequired().HasMaxLength(500);
+        builder.Property(i => i.ContentType).IsRequired().HasMaxLength(200);
+        builder.Property(i => i.UploadedAt).IsRequired();
+
+        builder.HasOne(i => i.Item).WithMany()
+            .HasForeignKey(i => i.ItemId).OnDelete(DeleteBehavior.Cascade);
+
+        builder.HasIndex(i => new { i.ItemId, i.SortOrder });
+    }
+}

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

@@ -29,7 +29,9 @@ public sealed class ProductConfigConfiguration : IEntityTypeConfiguration<Produc
         builder.Property(c => c.SerialNumbersEnabled).IsRequired().HasDefaultValue(true);
         builder.Property(c => c.BatchListsEnabled).IsRequired().HasDefaultValue(true);
         builder.Property(c => c.WarrantyPeriodsEnabled).IsRequired().HasDefaultValue(true);
-
+        builder.Property(c => c.CustomVariantsEnabled).IsRequired().HasDefaultValue(false);
+        builder.Property(c => c.ItemImagesEnabled).IsRequired().HasDefaultValue(false);
+        builder.Property(c => c.CustomWarrantyPeriodsEnabled).IsRequired().HasDefaultValue(false);
         // PostgreSQL xmin system column as the optimistic concurrency token (ETag).
         builder.Property(c => c.RowVersion).IsRowVersion();
 

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

@@ -0,0 +1,49 @@
+using ERPCore.Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+/// <summary>
+/// Configures the singleton sales-configuration row. The check constraint is what makes
+/// "singleton" a database guarantee rather than a convention (mirrors BranchConfig).
+/// </summary>
+public sealed class SalesConfigConfiguration : IEntityTypeConfiguration<SalesConfig>
+{
+    public void Configure(EntityTypeBuilder<SalesConfig> builder)
+    {
+        builder.ToTable("sales_config", t =>
+            t.HasCheckConstraint("ck_sales_config_singleton", $"\"ConfigId\" = {SalesConfig.SingletonId}"));
+
+        builder.HasKey(c => c.ConfigId);
+
+        // The id is fixed, never generated — there is exactly one row, seeded by DataSeeder.
+        builder.Property(c => c.ConfigId).ValueGeneratedNever();
+
+        builder.Property(c => c.AllowCashCustomer).IsRequired().HasDefaultValue(false);
+        // Sentinel = the CLR initializer (true), so an explicit false is still written on insert
+        // instead of being swallowed by the database default.
+        builder.Property(c => c.AllowFreeItems).IsRequired().HasDefaultValue(true).HasSentinel(true);
+        builder.Property(c => c.AllowDiscounts).IsRequired().HasDefaultValue(true).HasSentinel(true);
+        builder.Property(c => c.AllowOverStockSale).IsRequired().HasDefaultValue(false);
+        builder.Property(c => c.AllowWarehouseSelection).IsRequired().HasDefaultValue(true).HasSentinel(true);
+
+        builder.HasOne(c => c.DefaultWarehouse)
+            .WithMany()
+            .HasForeignKey(c => c.DefaultWarehouseId)
+            .OnDelete(DeleteBehavior.SetNull);
+
+        // PostgreSQL xmin system column as the optimistic concurrency token (ETag).
+        builder.Property(c => c.RowVersion).IsRowVersion();
+
+        builder.HasOne(c => c.CashCustomer)
+            .WithMany()
+            .HasForeignKey(c => c.CashCustomerId)
+            .OnDelete(DeleteBehavior.SetNull);
+
+        builder.HasOne(c => c.UpdatedByUser)
+            .WithMany()
+            .HasForeignKey(c => c.UpdatedBy)
+            .OnDelete(DeleteBehavior.Restrict);
+    }
+}

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

@@ -0,0 +1,27 @@
+using ERPCore.Domain.Entities;
+using ERPCore.Domain.Enums;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ERPCore.Infra.Persistence.Configurations;
+
+/// <summary>Custom warranty period master. No relationships — items store months, not a reference.</summary>
+public sealed class WarrantyPeriodConfiguration : IEntityTypeConfiguration<WarrantyPeriod>
+{
+    public void Configure(EntityTypeBuilder<WarrantyPeriod> builder)
+    {
+        builder.ToTable("warranty_periods", t =>
+            t.HasCheckConstraint("ck_warranty_periods_months", "\"Months\" BETWEEN 1 AND 600"));
+        builder.HasKey(p => p.WarrantyPeriodId);
+
+        builder.Property(p => p.Months).IsRequired();
+        builder.HasIndex(p => p.Months).IsUnique();
+
+        builder.Property(p => p.Status)
+            .HasConversion<string>().HasMaxLength(20).IsRequired()
+            .HasDefaultValue(EntityStatus.Active);
+
+        builder.Property(p => p.CreatedAt).IsRequired();
+        builder.HasIndex(p => p.Status);
+    }
+}

Backend/ERPCore/Infra/Persistence/DataSeeder.cs

@@ -46,6 +46,7 @@ public static class DataSeeder
         // dirty |= await SeedCompanyProfileAsync(db, ct);
         dirty |= await SeedProductConfigAsync(db, ct);
         dirty |= await SeedBranchConfigAsync(db, ct);
+        dirty |= await SeedSalesConfigAsync(db, ct);
         dirty |= await SeedNotificationConfigAsync(db, ct);
         dirty |= await SeedSalesMastersAsync(db, ct);
         dirty |= await SeedSalesStockAsync(db, ct);
@@ -106,7 +107,10 @@ public static class DataSeeder
             SellingPricesEnabled = true,
             SerialNumbersEnabled = true,
             BatchListsEnabled = true,
-            WarrantyPeriodsEnabled = true
+            WarrantyPeriodsEnabled = true,
+            CustomVariantsEnabled = false,
+            ItemImagesEnabled = false,
+            CustomWarrantyPeriodsEnabled = false
         });
         return true;
     }
@@ -128,6 +132,18 @@ public static class DataSeeder
         return true;
     }
 
+    /// <summary>
+    /// Ensures the singleton sales-config row exists. Starts with cash customer sales off, so
+    /// every sale needs a real customer until an admin opts in from Settings → Configuration → Sales Configuration.
+    /// </summary>
+    private static async Task<bool> SeedSalesConfigAsync(ErpDbContext db, CancellationToken ct)
+    {
+        if (await db.SalesConfig.AnyAsync(c => c.ConfigId == SalesConfig.SingletonId, ct)) return false;
+
+        db.SalesConfig.Add(new SalesConfig { ConfigId = SalesConfig.SingletonId, AllowCashCustomer = false });
+        return true;
+    }
+
     private static async Task<bool> SeedNotificationConfigAsync(ErpDbContext db, CancellationToken ct)
     {
         if (await db.NotificationConfig.AnyAsync(c => c.NotificationConfigId == NotificationConfig.SingletonId, ct)) return false;

Backend/ERPCore/Infra/Persistence/ErpDbContext.cs

@@ -35,6 +35,8 @@ public class ErpDbContext : DbContext
     public DbSet<TaxRate> TaxRates => Set<TaxRate>();
     public DbSet<Item> Items => Set<Item>();
     public DbSet<ItemReorder> ItemReorders => Set<ItemReorder>();
+    public DbSet<ItemImage> ItemImages => Set<ItemImage>();
+    public DbSet<WarrantyPeriod> WarrantyPeriods => Set<WarrantyPeriod>();
     public DbSet<Vendor> Vendors => Set<Vendor>();
     public DbSet<Warehouse> Warehouses => Set<Warehouse>();
     public DbSet<Bin> Bins => Set<Bin>();
@@ -43,6 +45,7 @@ public class ErpDbContext : DbContext
     public DbSet<ProductConfig> ProductConfig => Set<ProductConfig>();
     /// <summary>Singleton row gating whether this deployment uses branches at all.</summary>
     public DbSet<BranchConfig> BranchConfig => Set<BranchConfig>();
+    public DbSet<SalesConfig> SalesConfig => Set<SalesConfig>();
     /// <summary>Singleton row for notification delivery preferences.</summary>
     public DbSet<NotificationConfig> NotificationConfig => Set<NotificationConfig>();
     public DbSet<NotificationConfigModule> NotificationConfigModules => Set<NotificationConfigModule>();