diff --git a/DiunaBI.API/Controllers/JobsController.cs b/DiunaBI.API/Controllers/JobsController.cs
index ce4ed4d..cab4503 100644
--- a/DiunaBI.API/Controllers/JobsController.cs
+++ b/DiunaBI.API/Controllers/JobsController.cs
@@ -227,7 +227,8 @@ public class JobsController : Controller
             job.Status = JobStatus.Pending;
             job.RetryCount = 0;
             job.LastError = null;
-            job.ModifiedAtUtc = DateTime.UtcNow;
+            job.ModifiedAt = DateTime.UtcNow;
+            job.ModifiedById = DiunaBI.Domain.Entities.User.AutoImportUserId;
 
             await _db.SaveChangesAsync();
 
@@ -274,7 +275,8 @@ public class JobsController : Controller
 
             job.Status = JobStatus.Failed;
             job.LastError = "Cancelled by user";
-            job.ModifiedAtUtc = DateTime.UtcNow;
+            job.ModifiedAt = DateTime.UtcNow;
+            job.ModifiedById = DiunaBI.Domain.Entities.User.AutoImportUserId;
 
             await _db.SaveChangesAsync();
 
@@ -405,10 +407,9 @@ public class JobsController : Controller
                 MaxRetries = maxRetries,
                 Status = JobStatus.Pending,
                 CreatedAt = DateTime.UtcNow,
-                CreatedAtUtc = DateTime.UtcNow,
-                ModifiedAtUtc = DateTime.UtcNow,
-                CreatedById = Guid.Empty,
-                ModifiedById = Guid.Empty
+                ModifiedAt = DateTime.UtcNow,
+                CreatedById = DiunaBI.Domain.Entities.User.AutoImportUserId,
+                ModifiedById = DiunaBI.Domain.Entities.User.AutoImportUserId
             };
 
             _db.QueueJobs.Add(job);
diff --git a/DiunaBI.Domain/Entities/QueueJob.cs b/DiunaBI.Domain/Entities/QueueJob.cs
index bb44b7a..5545852 100644
--- a/DiunaBI.Domain/Entities/QueueJob.cs
+++ b/DiunaBI.Domain/Entities/QueueJob.cs
@@ -12,6 +12,7 @@ public class QueueJob
     public JobType JobType { get; set; }
     public int Priority { get; set; } = 0; // 0 = highest priority
     public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime ModifiedAt { get; set; } = DateTime.UtcNow;
     public int RetryCount { get; set; } = 0;
     public int MaxRetries { get; set; } = 5;
     public JobStatus Status { get; set; } = JobStatus.Pending;
@@ -19,9 +20,7 @@ public class QueueJob
     public DateTime? LastAttemptAt { get; set; }
     public DateTime? CompletedAt { get; set; }
     public Guid CreatedById { get; set; }
-    public DateTime CreatedAtUtc { get; set; } = DateTime.UtcNow;
     public Guid ModifiedById { get; set; }
-    public DateTime ModifiedAtUtc { get; set; } = DateTime.UtcNow;
 }
 
 public enum JobType
diff --git a/DiunaBI.Domain/Entities/User.cs b/DiunaBI.Domain/Entities/User.cs
index 59a60cc..b18d74b 100644
--- a/DiunaBI.Domain/Entities/User.cs
+++ b/DiunaBI.Domain/Entities/User.cs
@@ -5,6 +5,11 @@ namespace DiunaBI.Domain.Entities;
 
 public class User
 {
+    /// <summary>
+    /// System user ID for automated operations (imports, scheduled jobs, etc.)
+    /// </summary>
+    public static readonly Guid AutoImportUserId = Guid.Parse("f392209e-123e-4651-a5a4-0b1d6cf9ff9d");
+
     #region Properties
     public Guid Id { get; init; }
     public string? Email { get; init; }
diff --git a/DiunaBI.Infrastructure/Data/AppDbContext.cs b/DiunaBI.Infrastructure/Data/AppDbContext.cs
index 4110933..58b5280 100644
--- a/DiunaBI.Infrastructure/Data/AppDbContext.cs
+++ b/DiunaBI.Infrastructure/Data/AppDbContext.cs
@@ -136,9 +136,8 @@ public class AppDbContext(DbContextOptions<AppDbContext> options) : DbContext(op
         modelBuilder.Entity<QueueJob>().Property(x => x.LastAttemptAt);
         modelBuilder.Entity<QueueJob>().Property(x => x.CompletedAt);
         modelBuilder.Entity<QueueJob>().Property(x => x.CreatedById).IsRequired();
-        modelBuilder.Entity<QueueJob>().Property(x => x.CreatedAtUtc).IsRequired();
         modelBuilder.Entity<QueueJob>().Property(x => x.ModifiedById).IsRequired();
-        modelBuilder.Entity<QueueJob>().Property(x => x.ModifiedAtUtc).IsRequired();
+        modelBuilder.Entity<QueueJob>().Property(x => x.ModifiedAt).IsRequired();
         
         // Configure automatic timestamps for entities with CreatedAt/ModifiedAt
         ConfigureTimestamps(modelBuilder);
diff --git a/DiunaBI.Infrastructure/Migrations/20251208205202_RemoveQueueJobDuplicateUTCFields.Designer.cs b/DiunaBI.Infrastructure/Migrations/20251208205202_RemoveQueueJobDuplicateUTCFields.Designer.cs
new file mode 100644
index 0000000..218d1ad
--- /dev/null
+++ b/DiunaBI.Infrastructure/Migrations/20251208205202_RemoveQueueJobDuplicateUTCFields.Designer.cs
@@ -0,0 +1,489 @@
+// <auto-generated />
+using System;
+using DiunaBI.Infrastructure.Data;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+
+#nullable disable
+
+namespace DiunaBI.Infrastructure.Migrations
+{
+    [DbContext(typeof(AppDbContext))]
+    [Migration("20251208205202_RemoveQueueJobDuplicateUTCFields")]
+    partial class RemoveQueueJobDuplicateUTCFields
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "10.0.0")
+                .HasAnnotation("Relational:MaxIdentifierLength", 128);
+
+            SqlServerModelBuilderExtensions.UseIdentityColumns(modelBuilder);
+
+            modelBuilder.Entity("DiunaBI.Domain.Entities.DataInbox", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("datetime2")
+                        .HasDefaultValueSql("GETUTCDATE()");
+
+                    b.Property<string>("Data")
+                        .IsRequired()
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("nvarchar(50)");
+
+                    b.Property<string>("Source")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("nvarchar(50)");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("DataInbox");
+                });
+
+            modelBuilder.Entity("DiunaBI.Domain.Entities.Layer", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("datetime2")
+                        .HasDefaultValueSql("GETUTCDATE()");
+
+                    b.Property<Guid>("CreatedById")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<bool>("IsCancelled")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bit")
+                        .HasDefaultValue(false);
+
+                    b.Property<bool>("IsDeleted")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bit")
+                        .HasDefaultValue(false);
+
+                    b.Property<DateTime>("ModifiedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("datetime2")
+                        .HasDefaultValueSql("GETUTCDATE()");
+
+                    b.Property<Guid>("ModifiedById")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("nvarchar(50)");
+
+                    b.Property<int>("Number")
+                        .HasColumnType("int");
+
+                    b.Property<Guid?>("ParentId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<int>("Type")
+                        .HasColumnType("int");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("CreatedById");
+
+                    b.HasIndex("ModifiedById");
+
+                    b.ToTable("Layers");
+                });
+
+            modelBuilder.Entity("DiunaBI.Domain.Entities.ProcessSource", b =>
+                {
+                    b.Property<Guid>("LayerId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<Guid>("SourceId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.HasKey("LayerId", "SourceId");
+
+                    b.HasIndex("SourceId");
+
+                    b.ToTable("ProcessSources");
+                });
+
+            modelBuilder.Entity("DiunaBI.Domain.Entities.QueueJob", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<DateTime?>("CompletedAt")
+                        .HasColumnType("datetime2");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("datetime2")
+                        .HasDefaultValueSql("GETUTCDATE()");
+
+                    b.Property<Guid>("CreatedById")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<int>("JobType")
+                        .HasColumnType("int");
+
+                    b.Property<DateTime?>("LastAttemptAt")
+                        .HasColumnType("datetime2");
+
+                    b.Property<string>("LastError")
+                        .HasMaxLength(1000)
+                        .HasColumnType("nvarchar(1000)");
+
+                    b.Property<Guid>("LayerId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<string>("LayerName")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("nvarchar(200)");
+
+                    b.Property<int>("MaxRetries")
+                        .HasColumnType("int");
+
+                    b.Property<DateTime>("ModifiedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("datetime2")
+                        .HasDefaultValueSql("GETUTCDATE()");
+
+                    b.Property<Guid>("ModifiedById")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<string>("PluginName")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("nvarchar(100)");
+
+                    b.Property<int>("Priority")
+                        .HasColumnType("int");
+
+                    b.Property<int>("RetryCount")
+                        .HasColumnType("int");
+
+                    b.Property<int>("Status")
+                        .HasColumnType("int");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("QueueJobs");
+                });
+
+            modelBuilder.Entity("DiunaBI.Domain.Entities.Record", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<string>("Code")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("nvarchar(50)");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("datetime2")
+                        .HasDefaultValueSql("GETUTCDATE()");
+
+                    b.Property<Guid>("CreatedById")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<string>("Desc1")
+                        .HasMaxLength(10000)
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<bool>("IsDeleted")
+                        .HasColumnType("bit");
+
+                    b.Property<Guid>("LayerId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<DateTime>("ModifiedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("datetime2")
+                        .HasDefaultValueSql("GETUTCDATE()");
+
+                    b.Property<Guid>("ModifiedById")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<double?>("Value1")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value10")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value11")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value12")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value13")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value14")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value15")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value16")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value17")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value18")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value19")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value2")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value20")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value21")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value22")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value23")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value24")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value25")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value26")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value27")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value28")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value29")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value3")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value30")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value31")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value32")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value4")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value5")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value6")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value7")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value8")
+                        .HasColumnType("float");
+
+                    b.Property<double?>("Value9")
+                        .HasColumnType("float");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("CreatedById");
+
+                    b.HasIndex("LayerId");
+
+                    b.HasIndex("ModifiedById");
+
+                    b.ToTable("Records");
+                });
+
+            modelBuilder.Entity("DiunaBI.Domain.Entities.RecordHistory", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<int>("ChangeType")
+                        .HasColumnType("int");
+
+                    b.Property<DateTime>("ChangedAt")
+                        .HasColumnType("datetime2");
+
+                    b.Property<Guid>("ChangedById")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<string>("ChangedFields")
+                        .HasMaxLength(200)
+                        .HasColumnType("nvarchar(200)");
+
+                    b.Property<string>("ChangesSummary")
+                        .HasMaxLength(4000)
+                        .HasColumnType("nvarchar(4000)");
+
+                    b.Property<string>("Code")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("nvarchar(50)");
+
+                    b.Property<string>("Desc1")
+                        .HasMaxLength(10000)
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<Guid>("LayerId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<Guid>("RecordId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ChangedById");
+
+                    b.HasIndex("LayerId", "ChangedAt");
+
+                    b.HasIndex("RecordId", "ChangedAt");
+
+                    b.ToTable("RecordHistory");
+                });
+
+            modelBuilder.Entity("DiunaBI.Domain.Entities.User", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("datetime2")
+                        .HasDefaultValueSql("GETUTCDATE()");
+
+                    b.Property<string>("Email")
+                        .HasMaxLength(50)
+                        .HasColumnType("nvarchar(50)");
+
+                    b.Property<string>("UserName")
+                        .HasMaxLength(50)
+                        .HasColumnType("nvarchar(50)");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Users");
+                });
+
+            modelBuilder.Entity("DiunaBI.Domain.Entities.Layer", b =>
+                {
+                    b.HasOne("DiunaBI.Domain.Entities.User", "CreatedBy")
+                        .WithMany()
+                        .HasForeignKey("CreatedById")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.HasOne("DiunaBI.Domain.Entities.User", "ModifiedBy")
+                        .WithMany()
+                        .HasForeignKey("ModifiedById")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("CreatedBy");
+
+                    b.Navigation("ModifiedBy");
+                });
+
+            modelBuilder.Entity("DiunaBI.Domain.Entities.ProcessSource", b =>
+                {
+                    b.HasOne("DiunaBI.Domain.Entities.Layer", null)
+                        .WithMany()
+                        .HasForeignKey("LayerId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("DiunaBI.Domain.Entities.Layer", "Source")
+                        .WithMany()
+                        .HasForeignKey("SourceId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("Source");
+                });
+
+            modelBuilder.Entity("DiunaBI.Domain.Entities.Record", b =>
+                {
+                    b.HasOne("DiunaBI.Domain.Entities.User", "CreatedBy")
+                        .WithMany()
+                        .HasForeignKey("CreatedById")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.HasOne("DiunaBI.Domain.Entities.Layer", null)
+                        .WithMany("Records")
+                        .HasForeignKey("LayerId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("DiunaBI.Domain.Entities.User", "ModifiedBy")
+                        .WithMany()
+                        .HasForeignKey("ModifiedById")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("CreatedBy");
+
+                    b.Navigation("ModifiedBy");
+                });
+
+            modelBuilder.Entity("DiunaBI.Domain.Entities.RecordHistory", b =>
+                {
+                    b.HasOne("DiunaBI.Domain.Entities.User", "ChangedBy")
+                        .WithMany()
+                        .HasForeignKey("ChangedById")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("ChangedBy");
+                });
+
+            modelBuilder.Entity("DiunaBI.Domain.Entities.Layer", b =>
+                {
+                    b.Navigation("Records");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}
diff --git a/DiunaBI.Infrastructure/Migrations/20251208205202_RemoveQueueJobDuplicateUTCFields.cs b/DiunaBI.Infrastructure/Migrations/20251208205202_RemoveQueueJobDuplicateUTCFields.cs
new file mode 100644
index 0000000..7586b3c
--- /dev/null
+++ b/DiunaBI.Infrastructure/Migrations/20251208205202_RemoveQueueJobDuplicateUTCFields.cs
@@ -0,0 +1,52 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace DiunaBI.Infrastructure.Migrations
+{
+    /// <inheritdoc />
+    public partial class RemoveQueueJobDuplicateUTCFields : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "CreatedAtUtc",
+                table: "QueueJobs");
+
+            migrationBuilder.DropColumn(
+                name: "ModifiedAtUtc",
+                table: "QueueJobs");
+
+            migrationBuilder.AddColumn<DateTime>(
+                name: "ModifiedAt",
+                table: "QueueJobs",
+                type: "datetime2",
+                nullable: false,
+                defaultValueSql: "GETUTCDATE()");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "ModifiedAt",
+                table: "QueueJobs");
+
+            migrationBuilder.AddColumn<DateTime>(
+                name: "CreatedAtUtc",
+                table: "QueueJobs",
+                type: "datetime2",
+                nullable: false,
+                defaultValue: new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified));
+
+            migrationBuilder.AddColumn<DateTime>(
+                name: "ModifiedAtUtc",
+                table: "QueueJobs",
+                type: "datetime2",
+                nullable: false,
+                defaultValue: new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified));
+        }
+    }
+}
diff --git a/DiunaBI.Infrastructure/Migrations/AppDbContextModelSnapshot.cs b/DiunaBI.Infrastructure/Migrations/AppDbContextModelSnapshot.cs
index dd69cee..08fa40a 100644
--- a/DiunaBI.Infrastructure/Migrations/AppDbContextModelSnapshot.cs
+++ b/DiunaBI.Infrastructure/Migrations/AppDbContextModelSnapshot.cs
@@ -49,7 +49,7 @@ namespace DiunaBI.Infrastructure.Migrations
 
                     b.HasKey("Id");
 
-                    b.ToTable("DataInbox", (string)null);
+                    b.ToTable("DataInbox");
                 });
 
             modelBuilder.Entity("DiunaBI.Domain.Entities.Layer", b =>
@@ -104,7 +104,7 @@ namespace DiunaBI.Infrastructure.Migrations
 
                     b.HasIndex("ModifiedById");
 
-                    b.ToTable("Layers", (string)null);
+                    b.ToTable("Layers");
                 });
 
             modelBuilder.Entity("DiunaBI.Domain.Entities.ProcessSource", b =>
@@ -119,7 +119,7 @@ namespace DiunaBI.Infrastructure.Migrations
 
                     b.HasIndex("SourceId");
 
-                    b.ToTable("ProcessSources", (string)null);
+                    b.ToTable("ProcessSources");
                 });
 
             modelBuilder.Entity("DiunaBI.Domain.Entities.QueueJob", b =>
@@ -136,9 +136,6 @@ namespace DiunaBI.Infrastructure.Migrations
                         .HasColumnType("datetime2")
                         .HasDefaultValueSql("GETUTCDATE()");
 
-                    b.Property<DateTime>("CreatedAtUtc")
-                        .HasColumnType("datetime2");
-
                     b.Property<Guid>("CreatedById")
                         .HasColumnType("uniqueidentifier");
 
@@ -163,8 +160,10 @@ namespace DiunaBI.Infrastructure.Migrations
                     b.Property<int>("MaxRetries")
                         .HasColumnType("int");
 
-                    b.Property<DateTime>("ModifiedAtUtc")
-                        .HasColumnType("datetime2");
+                    b.Property<DateTime>("ModifiedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("datetime2")
+                        .HasDefaultValueSql("GETUTCDATE()");
 
                     b.Property<Guid>("ModifiedById")
                         .HasColumnType("uniqueidentifier");
@@ -185,7 +184,7 @@ namespace DiunaBI.Infrastructure.Migrations
 
                     b.HasKey("Id");
 
-                    b.ToTable("QueueJobs", (string)null);
+                    b.ToTable("QueueJobs");
                 });
 
             modelBuilder.Entity("DiunaBI.Domain.Entities.Record", b =>
@@ -329,7 +328,7 @@ namespace DiunaBI.Infrastructure.Migrations
 
                     b.HasIndex("ModifiedById");
 
-                    b.ToTable("Records", (string)null);
+                    b.ToTable("Records");
                 });
 
             modelBuilder.Entity("DiunaBI.Domain.Entities.RecordHistory", b =>
@@ -378,7 +377,7 @@ namespace DiunaBI.Infrastructure.Migrations
 
                     b.HasIndex("RecordId", "ChangedAt");
 
-                    b.ToTable("RecordHistory", (string)null);
+                    b.ToTable("RecordHistory");
                 });
 
             modelBuilder.Entity("DiunaBI.Domain.Entities.User", b =>
@@ -402,7 +401,7 @@ namespace DiunaBI.Infrastructure.Migrations
 
                     b.HasKey("Id");
 
-                    b.ToTable("Users", (string)null);
+                    b.ToTable("Users");
                 });
 
             modelBuilder.Entity("DiunaBI.Domain.Entities.Layer", b =>
diff --git a/DiunaBI.Infrastructure/Services/JobSchedulerService.cs b/DiunaBI.Infrastructure/Services/JobSchedulerService.cs
index f4dc19b..06a77ad 100644
--- a/DiunaBI.Infrastructure/Services/JobSchedulerService.cs
+++ b/DiunaBI.Infrastructure/Services/JobSchedulerService.cs
@@ -85,10 +85,9 @@ public class JobSchedulerService
                     MaxRetries = maxRetries,
                     Status = JobStatus.Pending,
                     CreatedAt = DateTime.UtcNow,
-                    CreatedAtUtc = DateTime.UtcNow,
-                    ModifiedAtUtc = DateTime.UtcNow,
-                    CreatedById = Guid.Empty, // System user
-                    ModifiedById = Guid.Empty
+                    ModifiedAt = DateTime.UtcNow,
+                    CreatedById = DiunaBI.Domain.Entities.User.AutoImportUserId,
+                    ModifiedById = DiunaBI.Domain.Entities.User.AutoImportUserId
                 };
 
                 _db.QueueJobs.Add(job);
@@ -175,10 +174,9 @@ public class JobSchedulerService
                     MaxRetries = maxRetries,
                     Status = JobStatus.Pending,
                     CreatedAt = DateTime.UtcNow,
-                    CreatedAtUtc = DateTime.UtcNow,
-                    ModifiedAtUtc = DateTime.UtcNow,
-                    CreatedById = Guid.Empty,
-                    ModifiedById = Guid.Empty
+                    ModifiedAt = DateTime.UtcNow,
+                    CreatedById = DiunaBI.Domain.Entities.User.AutoImportUserId,
+                    ModifiedById = DiunaBI.Domain.Entities.User.AutoImportUserId
                 };
 
                 _db.QueueJobs.Add(job);
diff --git a/DiunaBI.Infrastructure/Services/JobWorkerService.cs b/DiunaBI.Infrastructure/Services/JobWorkerService.cs
index 8c8f39a..cfd4f82 100644
--- a/DiunaBI.Infrastructure/Services/JobWorkerService.cs
+++ b/DiunaBI.Infrastructure/Services/JobWorkerService.cs
@@ -66,7 +66,8 @@ public class JobWorkerService : BackgroundService
         // Mark job as running
         job.Status = JobStatus.Running;
         job.LastAttemptAt = DateTime.UtcNow;
-        job.ModifiedAtUtc = DateTime.UtcNow;
+        job.ModifiedAt = DateTime.UtcNow;
+        job.ModifiedById = DiunaBI.Domain.Entities.User.AutoImportUserId;
         await db.SaveChangesAsync(stoppingToken);
 
         try
@@ -114,7 +115,8 @@ public class JobWorkerService : BackgroundService
             job.Status = JobStatus.Completed;
             job.CompletedAt = DateTime.UtcNow;
             job.LastError = null;
-            job.ModifiedAtUtc = DateTime.UtcNow;
+            job.ModifiedAt = DateTime.UtcNow;
+            job.ModifiedById = DiunaBI.Domain.Entities.User.AutoImportUserId;
 
             _logger.LogInformation("JobWorker: Job {JobId} completed successfully", job.Id);
 
@@ -131,7 +133,8 @@ public class JobWorkerService : BackgroundService
 
             // Capture full error details including inner exceptions
             job.LastError = GetFullErrorMessage(ex);
-            job.ModifiedAtUtc = DateTime.UtcNow;
+            job.ModifiedAt = DateTime.UtcNow;
+            job.ModifiedById = DiunaBI.Domain.Entities.User.AutoImportUserId;
 
             if (job.RetryCount >= job.MaxRetries)
             {
@@ -157,7 +160,8 @@ public class JobWorkerService : BackgroundService
 
                 // Increment retry count for next attempt
                 job.RetryCount++;
-                job.ModifiedAtUtc = DateTime.UtcNow;
+                job.ModifiedAt = DateTime.UtcNow;
+                job.ModifiedById = DiunaBI.Domain.Entities.User.AutoImportUserId;
             }
         }
         finally