diff --git a/SurveyBackend/SurveyBackend.Infrastructure/Data/ApplicationDbContext.cs b/SurveyBackend/SurveyBackend.Infrastructure/Data/ApplicationDbContext.cs
index 3a0cda7..5606c76 100644
--- a/SurveyBackend/SurveyBackend.Infrastructure/Data/ApplicationDbContext.cs
+++ b/SurveyBackend/SurveyBackend.Infrastructure/Data/ApplicationDbContext.cs
@@ -24,5 +24,11 @@ public class ApplicationDbContext : SurveyDbContext
             .WithMany()
             .HasForeignKey(s => s.CreatedBy)
             .OnDelete(DeleteBehavior.SetNull);
+
+        modelBuilder.Entity<Completion>()
+            .HasOne<User>()
+            .WithMany()
+            .HasForeignKey(c => c.CompletedBy)
+            .OnDelete(DeleteBehavior.SetNull);
     }
 }
\ No newline at end of file
diff --git a/SurveyBackend/SurveyBackend.Infrastructure/Data/Migrations/20250525200829_Completion update of SurveyLib.Designer.cs b/SurveyBackend/SurveyBackend.Infrastructure/Data/Migrations/20250525200829_Completion update of SurveyLib.Designer.cs
new file mode 100644
index 0000000..b94bc75
--- /dev/null
+++ b/SurveyBackend/SurveyBackend.Infrastructure/Data/Migrations/20250525200829_Completion update of SurveyLib.Designer.cs	
@@ -0,0 +1,321 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using SurveyBackend.Infrastructure.Data;
+
+#nullable disable
+
+namespace SurveyBackend.Infrastructure.Data.Migrations
+{
+    [DbContext(typeof(ApplicationDbContext))]
+    [Migration("20250525200829_Completion update of SurveyLib")]
+    partial class CompletionupdateofSurveyLib
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder.HasAnnotation("ProductVersion", "8.0.15");
+
+            modelBuilder.Entity("GroupUser", b =>
+                {
+                    b.Property<int>("GroupsId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("UsersId")
+                        .HasColumnType("INTEGER");
+
+                    b.HasKey("GroupsId", "UsersId");
+
+                    b.HasIndex("UsersId");
+
+                    b.ToTable("GroupUser");
+                });
+
+            modelBuilder.Entity("SurveyBackend.Core.Models.Group", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Label")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Groups");
+                });
+
+            modelBuilder.Entity("SurveyBackend.Core.Models.User", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Email")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("FirstName")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("LastName")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Password")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Users");
+                });
+
+            modelBuilder.Entity("SurveyLib.Core.Models.Answer", b =>
+                {
+                    b.Property<int>("CompletionId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("QuestionId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("AnswerText")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("CompletionId", "QuestionId");
+
+                    b.HasIndex("QuestionId");
+
+                    b.ToTable("Answers");
+                });
+
+            modelBuilder.Entity("SurveyLib.Core.Models.AnswerVariant", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("QuestionId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Text")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("QuestionId");
+
+                    b.ToTable("AnswerVariants");
+                });
+
+            modelBuilder.Entity("SurveyLib.Core.Models.Completion", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int?>("CompletedBy")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<DateTime>("FinishedAt")
+                        .HasColumnType("TEXT");
+
+                    b.Property<int>("SurveyId")
+                        .HasColumnType("INTEGER");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("CompletedBy");
+
+                    b.HasIndex("SurveyId");
+
+                    b.ToTable("Completions");
+                });
+
+            modelBuilder.Entity("SurveyLib.Core.Models.QuestionBase", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Discriminator")
+                        .IsRequired()
+                        .HasMaxLength(34)
+                        .HasColumnType("TEXT");
+
+                    b.Property<int>("SurveyId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Title")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("SurveyId");
+
+                    b.ToTable("Questions");
+
+                    b.HasDiscriminator().HasValue("QuestionBase");
+
+                    b.UseTphMappingStrategy();
+                });
+
+            modelBuilder.Entity("SurveyLib.Core.Models.Survey", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("TEXT");
+
+                    b.Property<int?>("CreatedBy")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Description")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Title")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("CreatedBy");
+
+                    b.ToTable("Surveys");
+                });
+
+            modelBuilder.Entity("SurveyLib.Core.Models.QuestionVariants.MultipleAnswerQuestion", b =>
+                {
+                    b.HasBaseType("SurveyLib.Core.Models.QuestionBase");
+
+                    b.HasDiscriminator().HasValue("MultipleAnswerQuestion");
+                });
+
+            modelBuilder.Entity("SurveyLib.Core.Models.QuestionVariants.SingleAnswerQuestion", b =>
+                {
+                    b.HasBaseType("SurveyLib.Core.Models.QuestionBase");
+
+                    b.HasDiscriminator().HasValue("SingleAnswerQuestion");
+                });
+
+            modelBuilder.Entity("SurveyLib.Core.Models.QuestionVariants.TextQuestion", b =>
+                {
+                    b.HasBaseType("SurveyLib.Core.Models.QuestionBase");
+
+                    b.HasDiscriminator().HasValue("TextQuestion");
+                });
+
+            modelBuilder.Entity("GroupUser", b =>
+                {
+                    b.HasOne("SurveyBackend.Core.Models.Group", null)
+                        .WithMany()
+                        .HasForeignKey("GroupsId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("SurveyBackend.Core.Models.User", null)
+                        .WithMany()
+                        .HasForeignKey("UsersId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("SurveyLib.Core.Models.Answer", b =>
+                {
+                    b.HasOne("SurveyLib.Core.Models.Completion", "Completion")
+                        .WithMany("Answers")
+                        .HasForeignKey("CompletionId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("SurveyLib.Core.Models.QuestionBase", "Question")
+                        .WithMany("Answers")
+                        .HasForeignKey("QuestionId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Completion");
+
+                    b.Navigation("Question");
+                });
+
+            modelBuilder.Entity("SurveyLib.Core.Models.AnswerVariant", b =>
+                {
+                    b.HasOne("SurveyLib.Core.Models.QuestionBase", "Question")
+                        .WithMany("AnswerVariants")
+                        .HasForeignKey("QuestionId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Question");
+                });
+
+            modelBuilder.Entity("SurveyLib.Core.Models.Completion", b =>
+                {
+                    b.HasOne("SurveyBackend.Core.Models.User", null)
+                        .WithMany()
+                        .HasForeignKey("CompletedBy")
+                        .OnDelete(DeleteBehavior.SetNull);
+
+                    b.HasOne("SurveyLib.Core.Models.Survey", "Survey")
+                        .WithMany("Completions")
+                        .HasForeignKey("SurveyId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Survey");
+                });
+
+            modelBuilder.Entity("SurveyLib.Core.Models.QuestionBase", b =>
+                {
+                    b.HasOne("SurveyLib.Core.Models.Survey", "Survey")
+                        .WithMany("Questions")
+                        .HasForeignKey("SurveyId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Survey");
+                });
+
+            modelBuilder.Entity("SurveyLib.Core.Models.Survey", b =>
+                {
+                    b.HasOne("SurveyBackend.Core.Models.User", null)
+                        .WithMany()
+                        .HasForeignKey("CreatedBy")
+                        .OnDelete(DeleteBehavior.SetNull);
+                });
+
+            modelBuilder.Entity("SurveyLib.Core.Models.Completion", b =>
+                {
+                    b.Navigation("Answers");
+                });
+
+            modelBuilder.Entity("SurveyLib.Core.Models.QuestionBase", b =>
+                {
+                    b.Navigation("AnswerVariants");
+
+                    b.Navigation("Answers");
+                });
+
+            modelBuilder.Entity("SurveyLib.Core.Models.Survey", b =>
+                {
+                    b.Navigation("Completions");
+
+                    b.Navigation("Questions");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}
diff --git a/SurveyBackend/SurveyBackend.Infrastructure/Data/Migrations/20250525200829_Completion update of SurveyLib.cs b/SurveyBackend/SurveyBackend.Infrastructure/Data/Migrations/20250525200829_Completion update of SurveyLib.cs
new file mode 100644
index 0000000..926f0e1
--- /dev/null
+++ b/SurveyBackend/SurveyBackend.Infrastructure/Data/Migrations/20250525200829_Completion update of SurveyLib.cs	
@@ -0,0 +1,49 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace SurveyBackend.Infrastructure.Data.Migrations
+{
+    /// <inheritdoc />
+    public partial class CompletionupdateofSurveyLib : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "CompletedBy",
+                table: "Completions",
+                type: "INTEGER",
+                nullable: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Completions_CompletedBy",
+                table: "Completions",
+                column: "CompletedBy");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Completions_Users_CompletedBy",
+                table: "Completions",
+                column: "CompletedBy",
+                principalTable: "Users",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.SetNull);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_Completions_Users_CompletedBy",
+                table: "Completions");
+
+            migrationBuilder.DropIndex(
+                name: "IX_Completions_CompletedBy",
+                table: "Completions");
+
+            migrationBuilder.DropColumn(
+                name: "CompletedBy",
+                table: "Completions");
+        }
+    }
+}
diff --git a/SurveyBackend/SurveyBackend.Infrastructure/Data/Migrations/ApplicationDbContextModelSnapshot.cs b/SurveyBackend/SurveyBackend.Infrastructure/Data/Migrations/ApplicationDbContextModelSnapshot.cs
index ab0d0cc..1d266bb 100644
--- a/SurveyBackend/SurveyBackend.Infrastructure/Data/Migrations/ApplicationDbContextModelSnapshot.cs
+++ b/SurveyBackend/SurveyBackend.Infrastructure/Data/Migrations/ApplicationDbContextModelSnapshot.cs
@@ -119,6 +119,9 @@ namespace SurveyBackend.Infrastructure.Data.Migrations
                         .ValueGeneratedOnAdd()
                         .HasColumnType("INTEGER");
 
+                    b.Property<int?>("CompletedBy")
+                        .HasColumnType("INTEGER");
+
                     b.Property<DateTime>("FinishedAt")
                         .HasColumnType("TEXT");
 
@@ -127,6 +130,8 @@ namespace SurveyBackend.Infrastructure.Data.Migrations
 
                     b.HasKey("Id");
 
+                    b.HasIndex("CompletedBy");
+
                     b.HasIndex("SurveyId");
 
                     b.ToTable("Completions");
@@ -256,6 +261,11 @@ namespace SurveyBackend.Infrastructure.Data.Migrations
 
             modelBuilder.Entity("SurveyLib.Core.Models.Completion", b =>
                 {
+                    b.HasOne("SurveyBackend.Core.Models.User", null)
+                        .WithMany()
+                        .HasForeignKey("CompletedBy")
+                        .OnDelete(DeleteBehavior.SetNull);
+
                     b.HasOne("SurveyLib.Core.Models.Survey", "Survey")
                         .WithMany("Completions")
                         .HasForeignKey("SurveyId")