Apis/cv-matcher-data/CvMatcherDbContext.cs

@@ -36,7 +36,7 @@ public sealed class CvMatcherDbContext : DbContext
             entity.Property(x => x.JobDocumentId).HasMaxLength(64).IsRequired();
             entity.Property(x => x.ResultJson).IsRequired();
             entity.Property(x => x.CreatedAt).HasDefaultValueSql("SYSUTCDATETIME()");
-            entity.HasIndex(x => new { x.CvDocumentId, x.JobDocumentId }).IsUnique();
+            entity.HasIndex(x => new { x.CvDocumentId, x.JobDocumentId, x.Language }).IsUnique();
         });
 
         modelBuilder.Entity<CvMatcherChatCacheEntity>(entity =>

Apis/cv-matcher-data/Migrations/20260601131043_UpdateResultsUniqueConstraintToIncludeLanguage.Designer.cs

@@ -1,4 +1,4 @@
-// <auto-generated />
+// <auto-generated />
 using System;
 using CvMatcher.Data;
 using Microsoft.EntityFrameworkCore;
@@ -12,7 +12,7 @@ using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
 namespace CvMatcher.Data.Migrations
 {
     [DbContext(typeof(CvMatcherDbContext))]
-    [Migration("20260529111000_UpdateResultsUniqueConstraintToIncludeLanguage")]
+    [Migration("20260601131043_UpdateResultsUniqueConstraintToIncludeLanguage")]
     partial class UpdateResultsUniqueConstraintToIncludeLanguage
     {
         /// <inheritdoc />
@@ -80,7 +80,7 @@ namespace CvMatcher.Data.Migrations
 
                     b.Property<string>("Language")
                         .IsRequired()
-                        .HasColumnType("nvarchar(max)");
+                        .HasColumnType("nvarchar(450)");
 
                     b.Property<string>("ResultJson")
                         .IsRequired()

Apis/cv-matcher-data/Migrations/20260601131043_UpdateResultsUniqueConstraintToIncludeLanguage.cs

@@ -1,5 +1,4 @@
-using Microsoft.EntityFrameworkCore.Migrations;
-using CvMatcher.Data;
+using Microsoft.EntityFrameworkCore.Migrations;
 
 #nullable disable
 
@@ -11,18 +10,23 @@ namespace CvMatcher.Data.Migrations
         /// <inheritdoc />
         protected override void Up(MigrationBuilder migrationBuilder)
         {
-            // The Language column was added in migration 20260524140335, but the unique constraint
-            // was never updated from (CvDocumentId, JobDocumentId) to include Language.
-            // This caused duplicate key violations when matching the same CV+Job in different languages.
-
             migrationBuilder.DropIndex(
                 name: "IX_Results_CvDocumentId_JobDocumentId",
-                schema: MigrationConstants.SchemaName,
+                schema: "cvMatcher",
                 table: "Results");
 
+            migrationBuilder.AlterColumn<string>(
+                name: "Language",
+                schema: "cvMatcher",
+                table: "Results",
+                type: "nvarchar(450)",
+                nullable: false,
+                oldClrType: typeof(string),
+                oldType: "nvarchar(max)");
+
             migrationBuilder.CreateIndex(
                 name: "IX_Results_CvDocumentId_JobDocumentId_Language",
-                schema: MigrationConstants.SchemaName,
+                schema: "cvMatcher",
                 table: "Results",
                 columns: new[] { "CvDocumentId", "JobDocumentId", "Language" },
                 unique: true);
@@ -33,12 +37,21 @@ namespace CvMatcher.Data.Migrations
         {
             migrationBuilder.DropIndex(
                 name: "IX_Results_CvDocumentId_JobDocumentId_Language",
-                schema: MigrationConstants.SchemaName,
+                schema: "cvMatcher",
                 table: "Results");
 
+            migrationBuilder.AlterColumn<string>(
+                name: "Language",
+                schema: "cvMatcher",
+                table: "Results",
+                type: "nvarchar(max)",
+                nullable: false,
+                oldClrType: typeof(string),
+                oldType: "nvarchar(450)");
+
             migrationBuilder.CreateIndex(
                 name: "IX_Results_CvDocumentId_JobDocumentId",
-                schema: MigrationConstants.SchemaName,
+                schema: "cvMatcher",
                 table: "Results",
                 columns: new[] { "CvDocumentId", "JobDocumentId" },
                 unique: true);

Apis/cv-matcher-data/Migrations/CvMatcherDbContextModelSnapshot.cs

@@ -1,4 +1,4 @@
-// <auto-generated />
+// <auto-generated />
 using System;
 using CvMatcher.Data;
 using Microsoft.EntityFrameworkCore;
@@ -77,7 +77,7 @@ namespace CvMatcher.Data.Migrations
 
                     b.Property<string>("Language")
                         .IsRequired()
-                        .HasColumnType("nvarchar(max)");
+                        .HasColumnType("nvarchar(450)");
 
                     b.Property<string>("ResultJson")
                         .IsRequired()
@@ -88,7 +88,7 @@ namespace CvMatcher.Data.Migrations
 
                     b.HasKey("Id");
 
-                    b.HasIndex("CvDocumentId", "JobDocumentId")
+                    b.HasIndex("CvDocumentId", "JobDocumentId", "Language")
                         .IsUnique();
 
                     b.ToTable("Results", "cvMatcher");

Apis/cv-matcher-data/Repositories/EfMatcherRepository.cs

@@ -48,18 +48,27 @@ public sealed class EfMatcherRepository : IMatcherRepository
 
         if (exists) return;
 
-        _db.CvMatchResults.Add(new CvMatchResultEntity
+        try
         {
-            Id = Guid.NewGuid().ToString("N"),
-            CvDocumentId = cvDocumentId,
-            JobDocumentId = jobDocumentId,
-            Language = language,
-            ResultJson = JsonSerializer.Serialize(response, new JsonSerializerOptions(JsonSerializerDefaults.Web)),
-            Score = response.Score,
-            CreatedAt = DateTime.UtcNow
-        });
+            _db.CvMatchResults.Add(new CvMatchResultEntity
+            {
+                Id = Guid.NewGuid().ToString("N"),
+                CvDocumentId = cvDocumentId,
+                JobDocumentId = jobDocumentId,
+                Language = language,
+                ResultJson = JsonSerializer.Serialize(response, new JsonSerializerOptions(JsonSerializerDefaults.Web)),
+                Score = response.Score,
+                CreatedAt = DateTime.UtcNow
+            });
 
-        await _db.SaveChangesAsync(ct);
+            await _db.SaveChangesAsync(ct);
+        }
+        catch (DbUpdateException ex) when (ex.InnerException?.Message.Contains("IX_Results_CvDocumentId_JobDocumentId_Language") == true
+                                          || ex.InnerException?.Message.Contains("unique") == true)
+        {
+            // Duplicate key violation: record was inserted between the AnyAsync check and SaveChangesAsync.
+            // This is safe to ignore — the match result already exists in the database.
+        }
     }
 
     public async Task<string?> GetChatCompletionAsync(string cacheKey, CancellationToken ct)