adding complete db migrations from posgres

Backend/ERPCore/Domain/Entities/Branch.cs

@@ -9,6 +9,18 @@ namespace ERPCore.Domain.Entities;
 /// </summary>
 public class Branch
 {
+    /// <summary>
+    /// Code of the deployment's default branch. Every branch-scoped entity has a
+    /// non-nullable <c>BranchId</c> with a Restrict FK, so this row must exist before any
+    /// of them can be written — see <c>DataSeeder.EnsureDefaultBranchAsync</c>, which
+    /// creates it at startup, and <c>BranchConfigService.ResolveDefaultBranchIdAsync</c>,
+    /// which is the lazy runtime fallback.
+    /// </summary>
+    public const string DefaultCode = "BR-000";
+
+    /// <summary>Display name paired with <see cref="DefaultCode"/>.</summary>
+    public const string DefaultName = "Main Branch";
+
     public int BranchId { get; set; }
 
     /// <summary>Server-generated on create ("BR-001", "BR-002", ...) — never accepted from the client.</summary>

Backend/ERPCore/Domain/Entities/BundleSale.cs

@@ -27,7 +27,7 @@ public class BundleSale
     public decimal GrandTotal { get; set; }
     public DateTime CreatedAt { get; set; }
     public DateTime? UpdatedAt { get; set; }
-    public int ConcurrencyStamp { get; set; }
+    public uint RowVersion { get; set; }
 
     /// <summary>Set once this bundle's business date is closed by <see cref="SalesDayEnd"/> — a
     /// closed bundle sale is frozen (no further edits). Same role as <see cref="SalesSlip.DayEndId"/>;

Backend/ERPCore/Domain/Entities/BundleSaleTemplate.cs

@@ -11,7 +11,7 @@ public class BundleSaleTemplate
     public EntityStatus Status { get; set; } = EntityStatus.Active;
     public DateTime CreatedAt { get; set; }
     public DateTime? UpdatedAt { get; set; }
-    public int ConcurrencyStamp { get; set; }
+    public uint RowVersion { get; set; }
 
     public ICollection<BundleSaleTemplateLine> Lines { get; set; } = new List<BundleSaleTemplateLine>();
 }