Index: iknow-api/Migrations/20251027191028_dbRelations.Designer.cs
===================================================================
--- iknow-api/Migrations/20251027191028_dbRelations.Designer.cs	(revision b38c39caa5327b5c3dffc7da82ccae5b655835fa)
+++ iknow-api/Migrations/20251027191028_dbRelations.Designer.cs	(revision b38c39caa5327b5c3dffc7da82ccae5b655835fa)
@@ -0,0 +1,193 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+using iknow_api.Data;
+
+#nullable disable
+
+namespace iknow_api.Migrations
+{
+    [DbContext(typeof(AppDbContext))]
+    [Migration("20251027191028_dbRelations")]
+    partial class dbRelations
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "9.0.10")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("iknow_api.Models.ContactInfo", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<int>("UserId")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("address")
+                        .HasColumnType("text");
+
+                    b.Property<string>("city")
+                        .HasColumnType("text");
+
+                    b.Property<string>("microsoftEmail")
+                        .HasColumnType("text");
+
+                    b.Property<string>("municipality")
+                        .HasColumnType("text");
+
+                    b.Property<string>("phoneNumber")
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("UserId")
+                        .IsUnique();
+
+                    b.ToTable("ContactInfo");
+                });
+
+            modelBuilder.Entity("iknow_api.Models.EnrollmentInfo", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<int>("UserId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("enrollmentYear")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("major")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("UserId")
+                        .IsUnique();
+
+                    b.ToTable("EnrollmentInfo");
+                });
+
+            modelBuilder.Entity("iknow_api.Models.HighSchool", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<float>("GPA")
+                        .HasColumnType("real");
+
+                    b.Property<int>("UserId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("tip")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("UserId")
+                        .IsUnique();
+
+                    b.ToTable("HighSchool");
+                });
+
+            modelBuilder.Entity("iknow_api.Models.User", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<DateTime>("Bday")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("Email")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Index")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Name")
+                        .HasColumnType("text");
+
+                    b.Property<string>("PasswordHash")
+                        .HasColumnType("text");
+
+                    b.Property<int>("Role")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Surname")
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("User");
+                });
+
+            modelBuilder.Entity("iknow_api.Models.ContactInfo", b =>
+                {
+                    b.HasOne("iknow_api.Models.User", "User")
+                        .WithOne("ContactInfo")
+                        .HasForeignKey("iknow_api.Models.ContactInfo", "UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("User");
+                });
+
+            modelBuilder.Entity("iknow_api.Models.EnrollmentInfo", b =>
+                {
+                    b.HasOne("iknow_api.Models.User", "User")
+                        .WithOne("EnrollmentInfo")
+                        .HasForeignKey("iknow_api.Models.EnrollmentInfo", "UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("User");
+                });
+
+            modelBuilder.Entity("iknow_api.Models.HighSchool", b =>
+                {
+                    b.HasOne("iknow_api.Models.User", "User")
+                        .WithOne("HighSchool")
+                        .HasForeignKey("iknow_api.Models.HighSchool", "UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("User");
+                });
+
+            modelBuilder.Entity("iknow_api.Models.User", b =>
+                {
+                    b.Navigation("ContactInfo");
+
+                    b.Navigation("EnrollmentInfo");
+
+                    b.Navigation("HighSchool");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}
Index: iknow-api/Migrations/20251027191028_dbRelations.cs
===================================================================
--- iknow-api/Migrations/20251027191028_dbRelations.cs	(revision b38c39caa5327b5c3dffc7da82ccae5b655835fa)
+++ iknow-api/Migrations/20251027191028_dbRelations.cs	(revision b38c39caa5327b5c3dffc7da82ccae5b655835fa)
@@ -0,0 +1,75 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace iknow_api.Migrations
+{
+    /// <inheritdoc />
+    public partial class dbRelations : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropIndex(
+                name: "IX_HighSchool_UserId",
+                table: "HighSchool");
+
+            migrationBuilder.DropIndex(
+                name: "IX_EnrollmentInfo_UserId",
+                table: "EnrollmentInfo");
+
+            migrationBuilder.DropIndex(
+                name: "IX_ContactInfo_UserId",
+                table: "ContactInfo");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_HighSchool_UserId",
+                table: "HighSchool",
+                column: "UserId",
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_EnrollmentInfo_UserId",
+                table: "EnrollmentInfo",
+                column: "UserId",
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ContactInfo_UserId",
+                table: "ContactInfo",
+                column: "UserId",
+                unique: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropIndex(
+                name: "IX_HighSchool_UserId",
+                table: "HighSchool");
+
+            migrationBuilder.DropIndex(
+                name: "IX_EnrollmentInfo_UserId",
+                table: "EnrollmentInfo");
+
+            migrationBuilder.DropIndex(
+                name: "IX_ContactInfo_UserId",
+                table: "ContactInfo");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_HighSchool_UserId",
+                table: "HighSchool",
+                column: "UserId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_EnrollmentInfo_UserId",
+                table: "EnrollmentInfo",
+                column: "UserId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ContactInfo_UserId",
+                table: "ContactInfo",
+                column: "UserId");
+        }
+    }
+}
Index: iknow-api/Migrations/AppDbContextModelSnapshot.cs
===================================================================
--- iknow-api/Migrations/AppDbContextModelSnapshot.cs	(revision cab02ada65fcd8feda776e5afc86a355f29c7f96)
+++ iknow-api/Migrations/AppDbContextModelSnapshot.cs	(revision b38c39caa5327b5c3dffc7da82ccae5b655835fa)
@@ -51,5 +51,6 @@
                     b.HasKey("Id");
 
-                    b.HasIndex("UserId");
+                    b.HasIndex("UserId")
+                        .IsUnique();
 
                     b.ToTable("ContactInfo");
@@ -75,5 +76,6 @@
                     b.HasKey("Id");
 
-                    b.HasIndex("UserId");
+                    b.HasIndex("UserId")
+                        .IsUnique();
 
                     b.ToTable("EnrollmentInfo");
@@ -99,5 +101,6 @@
                     b.HasKey("Id");
 
-                    b.HasIndex("UserId");
+                    b.HasIndex("UserId")
+                        .IsUnique();
 
                     b.ToTable("HighSchool");
@@ -144,6 +147,6 @@
                 {
                     b.HasOne("iknow_api.Models.User", "User")
-                        .WithMany()
-                        .HasForeignKey("UserId")
+                        .WithOne("ContactInfo")
+                        .HasForeignKey("iknow_api.Models.ContactInfo", "UserId")
                         .OnDelete(DeleteBehavior.Cascade)
                         .IsRequired();
@@ -155,6 +158,6 @@
                 {
                     b.HasOne("iknow_api.Models.User", "User")
-                        .WithMany()
-                        .HasForeignKey("UserId")
+                        .WithOne("EnrollmentInfo")
+                        .HasForeignKey("iknow_api.Models.EnrollmentInfo", "UserId")
                         .OnDelete(DeleteBehavior.Cascade)
                         .IsRequired();
@@ -166,6 +169,6 @@
                 {
                     b.HasOne("iknow_api.Models.User", "User")
-                        .WithMany()
-                        .HasForeignKey("UserId")
+                        .WithOne("HighSchool")
+                        .HasForeignKey("iknow_api.Models.HighSchool", "UserId")
                         .OnDelete(DeleteBehavior.Cascade)
                         .IsRequired();
@@ -173,4 +176,13 @@
                     b.Navigation("User");
                 });
+
+            modelBuilder.Entity("iknow_api.Models.User", b =>
+                {
+                    b.Navigation("ContactInfo");
+
+                    b.Navigation("EnrollmentInfo");
+
+                    b.Navigation("HighSchool");
+                });
 #pragma warning restore 612, 618
         }