issue #2551

BMA.EHR.Infrastructure/Migrations/LeaveDb/20260619032119_Add Unique Index LeaveBeginning ProfileId Year TypeId.cs

@@ -0,0 +1,28 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace BMA.EHR.Infrastructure.Migrations.LeaveDb
+{
+    /// <inheritdoc />
+    public partial class AddUniqueIndexLeaveBeginningProfileIdYearTypeId : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateIndex(
+                name: "IX_LeaveBeginnings_ProfileId_LeaveYear_LeaveTypeId",
+                table: "LeaveBeginnings",
+                columns: new[] { "ProfileId", "LeaveYear", "LeaveTypeId" },
+                unique: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropIndex(
+                name: "IX_LeaveBeginnings_ProfileId_LeaveYear_LeaveTypeId",
+                table: "LeaveBeginnings");
+        }
+    }
+}

BMA.EHR.Infrastructure/Migrations/LeaveDb/LeaveDbContextModelSnapshot.cs

@@ -226,6 +226,10 @@ namespace BMA.EHR.Infrastructure.Migrations.LeaveDb
 
                     b.HasIndex("LeaveTypeId");
 
+                    b.HasIndex("ProfileId", "LeaveYear", "LeaveTypeId")
+                        .IsUnique()
+                        .HasDatabaseName("IX_LeaveBeginnings_ProfileId_LeaveYear_LeaveTypeId");
+
                     b.ToTable("LeaveBeginnings");
                 });
 

BMA.EHR.Infrastructure/Persistence/LeaveDbContext.cs

@@ -61,5 +61,18 @@ namespace BMA.EHR.Infrastructure.Persistence
         {
             base.Entry(entity).State = EntityState.Detached;
         }
+
+        protected override void OnModelCreating(ModelBuilder modelBuilder)
+        {
+            base.OnModelCreating(modelBuilder);
+
+            // Composite unique index on the natural key for LeaveBeginning.
+            // Prevents duplicate rows when concurrent requests (e.g. UI calling /user/check twice)
+            // race through the get-or-create flow in LeaveBeginningRepository.
+            modelBuilder.Entity<LeaveBeginning>()
+                .HasIndex(b => new { b.ProfileId, b.LeaveYear, b.LeaveTypeId })
+                .HasDatabaseName("IX_LeaveBeginnings_ProfileId_LeaveYear_LeaveTypeId")
+                .IsUnique();
+        }
     }
 }