diff --git a/Hospital/HospitalDatabaseImplement/HospitalDatabase.cs b/Hospital/HospitalDatabaseImplement/HospitalDatabase.cs
index 8822435..e00d55a 100644
--- a/Hospital/HospitalDatabaseImplement/HospitalDatabase.cs
+++ b/Hospital/HospitalDatabaseImplement/HospitalDatabase.cs
@@ -1,5 +1,12 @@
 using HospitalDatabaseImplement.Models;
 using Microsoft.EntityFrameworkCore;
+using System.Reflection.Metadata;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
 
 namespace HospitalDatabaseImplement
 {
@@ -13,6 +20,26 @@ namespace HospitalDatabaseImplement
             }
             base.OnConfiguring(optionsBuilder);
         }
+
+        protected override void OnModelCreating(ModelBuilder modelBuilder)
+        {
+            base.OnModelCreating(modelBuilder);
+            // решение проблемы с циклическим удалением - запрет на удаление аптекарей, если они связаны с другими сущностями
+            modelBuilder
+            .Entity<Medicine>().HasOne(e => e.Apothecary)
+            .WithMany(e => e.Medicines)
+            .OnDelete(DeleteBehavior.Restrict);
+
+            modelBuilder
+            .Entity<Recipe>().HasOne(e => e.Apothecary)
+            .WithMany(e => e.Recipes)
+            .OnDelete(DeleteBehavior.Restrict);
+
+            modelBuilder
+            .Entity<Prescription>().HasOne(e => e.Apothecary)
+            .WithMany(e => e.Prescriptions)
+            .OnDelete(DeleteBehavior.Restrict);
+        }
         public virtual DbSet<Apothecary> Apothecaries { set; get; }
         public virtual DbSet<Recipe> Recipes { set; get; }
         public virtual DbSet<Medicine> Medicines { set; get; }
diff --git a/Hospital/HospitalDatabaseImplement/Migrations/20230405144953_InitialCreate.Designer.cs b/Hospital/HospitalDatabaseImplement/Migrations/20230406091825_InitCreate.Designer.cs
similarity index 95%
rename from Hospital/HospitalDatabaseImplement/Migrations/20230405144953_InitialCreate.Designer.cs
rename to Hospital/HospitalDatabaseImplement/Migrations/20230406091825_InitCreate.Designer.cs
index ef464e0..158d2c2 100644
--- a/Hospital/HospitalDatabaseImplement/Migrations/20230405144953_InitialCreate.Designer.cs
+++ b/Hospital/HospitalDatabaseImplement/Migrations/20230406091825_InitCreate.Designer.cs
@@ -12,8 +12,8 @@ using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
 namespace HospitalDatabaseImplement.Migrations
 {
     [DbContext(typeof(HospitalDatabase))]
-    [Migration("20230405144953_InitialCreate")]
-    partial class InitialCreate
+    [Migration("20230406091825_InitCreate")]
+    partial class InitCreate
     {
         /// <inheritdoc />
         protected override void BuildTargetModel(ModelBuilder modelBuilder)
@@ -98,6 +98,7 @@ namespace HospitalDatabaseImplement.Migrations
                         .HasColumnType("nvarchar(max)");
 
                     b.Property<string>("Surname")
+                        .IsRequired()
                         .HasColumnType("nvarchar(max)");
 
                     b.Property<int>("TreatmentId")
@@ -296,9 +297,9 @@ namespace HospitalDatabaseImplement.Migrations
             modelBuilder.Entity("HospitalDatabaseImplement.Models.Medicine", b =>
                 {
                     b.HasOne("HospitalDatabaseImplement.Models.Apothecary", "Apothecary")
-                        .WithMany()
+                        .WithMany("Medicines")
                         .HasForeignKey("ApothecaryId")
-                        .OnDelete(DeleteBehavior.Cascade)
+                        .OnDelete(DeleteBehavior.Restrict)
                         .IsRequired();
 
                     b.Navigation("Apothecary");
@@ -318,9 +319,9 @@ namespace HospitalDatabaseImplement.Migrations
             modelBuilder.Entity("HospitalDatabaseImplement.Models.Prescription", b =>
                 {
                     b.HasOne("HospitalDatabaseImplement.Models.Apothecary", "Apothecary")
-                        .WithMany()
+                        .WithMany("Prescriptions")
                         .HasForeignKey("ApothecaryId")
-                        .OnDelete(DeleteBehavior.Cascade)
+                        .OnDelete(DeleteBehavior.Restrict)
                         .IsRequired();
 
                     b.HasOne("HospitalDatabaseImplement.Models.Medicine", "Medicine")
@@ -356,9 +357,9 @@ namespace HospitalDatabaseImplement.Migrations
             modelBuilder.Entity("HospitalDatabaseImplement.Models.Recipe", b =>
                 {
                     b.HasOne("HospitalDatabaseImplement.Models.Apothecary", "Apothecary")
-                        .WithMany()
+                        .WithMany("Recipes")
                         .HasForeignKey("ApothecaryId")
-                        .OnDelete(DeleteBehavior.Cascade)
+                        .OnDelete(DeleteBehavior.Restrict)
                         .IsRequired();
 
                     b.Navigation("Apothecary");
@@ -421,6 +422,15 @@ namespace HospitalDatabaseImplement.Migrations
                     b.Navigation("Treatment");
                 });
 
+            modelBuilder.Entity("HospitalDatabaseImplement.Models.Apothecary", b =>
+                {
+                    b.Navigation("Medicines");
+
+                    b.Navigation("Prescriptions");
+
+                    b.Navigation("Recipes");
+                });
+
             modelBuilder.Entity("HospitalDatabaseImplement.Models.Medicine", b =>
                 {
                     b.Navigation("Prescriptions");
diff --git a/Hospital/HospitalDatabaseImplement/Migrations/20230405144953_InitialCreate.cs b/Hospital/HospitalDatabaseImplement/Migrations/20230406091825_InitCreate.cs
similarity index 98%
rename from Hospital/HospitalDatabaseImplement/Migrations/20230405144953_InitialCreate.cs
rename to Hospital/HospitalDatabaseImplement/Migrations/20230406091825_InitCreate.cs
index bf85384..b7d646f 100644
--- a/Hospital/HospitalDatabaseImplement/Migrations/20230405144953_InitialCreate.cs
+++ b/Hospital/HospitalDatabaseImplement/Migrations/20230406091825_InitCreate.cs
@@ -6,7 +6,7 @@ using Microsoft.EntityFrameworkCore.Migrations;
 namespace HospitalDatabaseImplement.Migrations
 {
     /// <inheritdoc />
-    public partial class InitialCreate : Migration
+    public partial class InitCreate : Migration
     {
         /// <inheritdoc />
         protected override void Up(MigrationBuilder migrationBuilder)
@@ -60,7 +60,7 @@ namespace HospitalDatabaseImplement.Migrations
                     Name = table.Column<string>(type: "nvarchar(60)", maxLength: 60, nullable: false),
                     Cost = table.Column<double>(type: "float", nullable: false),
                     Dose = table.Column<string>(type: "nvarchar(10)", maxLength: 10, nullable: false),
-                    ApothecaryId = table.Column<int>(type: "int", nullable: false, defaultValue: -1)
+                    ApothecaryId = table.Column<int>(type: "int", nullable: false)
                 },
                 constraints: table =>
                 {
@@ -70,7 +70,7 @@ namespace HospitalDatabaseImplement.Migrations
                         column: x => x.ApothecaryId,
                         principalTable: "Apothecaries",
                         principalColumn: "Id",
-                        onDelete: ReferentialAction.SetDefault);
+                        onDelete: ReferentialAction.Restrict);
                 });
 
             migrationBuilder.CreateTable(
@@ -91,7 +91,7 @@ namespace HospitalDatabaseImplement.Migrations
                         column: x => x.ApothecaryId,
                         principalTable: "Apothecaries",
                         principalColumn: "Id",
-                        onDelete: ReferentialAction.Cascade);
+                        onDelete: ReferentialAction.Restrict);
                 });
 
             migrationBuilder.CreateTable(
@@ -100,7 +100,7 @@ namespace HospitalDatabaseImplement.Migrations
                 {
                     Id = table.Column<int>(type: "int", nullable: false)
                         .Annotation("SqlServer:Identity", "1, 1"),
-                    Surname = table.Column<string>(type: "nvarchar(max)", nullable: true),
+                    Surname = table.Column<string>(type: "nvarchar(max)", nullable: false),
                     Name = table.Column<string>(type: "nvarchar(max)", nullable: false),
                     Patronymic = table.Column<string>(type: "nvarchar(max)", nullable: true),
                     BirthDate = table.Column<DateTime>(type: "datetime2", nullable: false),
@@ -162,7 +162,7 @@ namespace HospitalDatabaseImplement.Migrations
                         column: x => x.ApothecaryId,
                         principalTable: "Apothecaries",
                         principalColumn: "Id",
-                        onDelete: ReferentialAction.Cascade);
+                        onDelete: ReferentialAction.Restrict);
                     table.ForeignKey(
                         name: "FK_Prescriptions_Medicines_MedicineId",
                         column: x => x.MedicineId,
diff --git a/Hospital/HospitalDatabaseImplement/Migrations/HospitalDatabaseModelSnapshot.cs b/Hospital/HospitalDatabaseImplement/Migrations/HospitalDatabaseModelSnapshot.cs
index 913ba06..09f3225 100644
--- a/Hospital/HospitalDatabaseImplement/Migrations/HospitalDatabaseModelSnapshot.cs
+++ b/Hospital/HospitalDatabaseImplement/Migrations/HospitalDatabaseModelSnapshot.cs
@@ -95,6 +95,7 @@ namespace HospitalDatabaseImplement.Migrations
                         .HasColumnType("nvarchar(max)");
 
                     b.Property<string>("Surname")
+                        .IsRequired()
                         .HasColumnType("nvarchar(max)");
 
                     b.Property<int>("TreatmentId")
@@ -293,9 +294,9 @@ namespace HospitalDatabaseImplement.Migrations
             modelBuilder.Entity("HospitalDatabaseImplement.Models.Medicine", b =>
                 {
                     b.HasOne("HospitalDatabaseImplement.Models.Apothecary", "Apothecary")
-                        .WithMany()
+                        .WithMany("Medicines")
                         .HasForeignKey("ApothecaryId")
-                        .OnDelete(DeleteBehavior.Cascade)
+                        .OnDelete(DeleteBehavior.Restrict)
                         .IsRequired();
 
                     b.Navigation("Apothecary");
@@ -315,9 +316,9 @@ namespace HospitalDatabaseImplement.Migrations
             modelBuilder.Entity("HospitalDatabaseImplement.Models.Prescription", b =>
                 {
                     b.HasOne("HospitalDatabaseImplement.Models.Apothecary", "Apothecary")
-                        .WithMany()
+                        .WithMany("Prescriptions")
                         .HasForeignKey("ApothecaryId")
-                        .OnDelete(DeleteBehavior.Cascade)
+                        .OnDelete(DeleteBehavior.Restrict)
                         .IsRequired();
 
                     b.HasOne("HospitalDatabaseImplement.Models.Medicine", "Medicine")
@@ -353,9 +354,9 @@ namespace HospitalDatabaseImplement.Migrations
             modelBuilder.Entity("HospitalDatabaseImplement.Models.Recipe", b =>
                 {
                     b.HasOne("HospitalDatabaseImplement.Models.Apothecary", "Apothecary")
-                        .WithMany()
+                        .WithMany("Recipes")
                         .HasForeignKey("ApothecaryId")
-                        .OnDelete(DeleteBehavior.Cascade)
+                        .OnDelete(DeleteBehavior.Restrict)
                         .IsRequired();
 
                     b.Navigation("Apothecary");
@@ -418,6 +419,15 @@ namespace HospitalDatabaseImplement.Migrations
                     b.Navigation("Treatment");
                 });
 
+            modelBuilder.Entity("HospitalDatabaseImplement.Models.Apothecary", b =>
+                {
+                    b.Navigation("Medicines");
+
+                    b.Navigation("Prescriptions");
+
+                    b.Navigation("Recipes");
+                });
+
             modelBuilder.Entity("HospitalDatabaseImplement.Models.Medicine", b =>
                 {
                     b.Navigation("Prescriptions");
diff --git a/Hospital/HospitalDatabaseImplement/Models/Apothecary.cs b/Hospital/HospitalDatabaseImplement/Models/Apothecary.cs
index e5d2e4d..a1de5de 100644
--- a/Hospital/HospitalDatabaseImplement/Models/Apothecary.cs
+++ b/Hospital/HospitalDatabaseImplement/Models/Apothecary.cs
@@ -2,6 +2,7 @@
 using HospitalContracts.ViewModels;
 using HospitalDataModels.Models;
 using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
 
 namespace HospitalDatabaseImplement.Models
 {
@@ -15,6 +16,15 @@ namespace HospitalDatabaseImplement.Models
         [MaxLength(55)]
         public string Password { get; private set; } = string.Empty;
 
+        [ForeignKey("ApothecaryId")]
+        public virtual List<Medicine> Medicines { get; set; } = new();
+
+        [ForeignKey("ApothecaryId")]
+        public virtual List<Recipe> Recipes { get; set; } = new();
+
+        [ForeignKey("ApothecaryId")]
+        public virtual List<Prescription> Prescriptions { get; set; } = new();
+
         public static Apothecary? Create(ApothecaryBindingModel model)
         {
             if (model == null)
diff --git a/Hospital/HospitalDatabaseImplement/Models/Medicine.cs b/Hospital/HospitalDatabaseImplement/Models/Medicine.cs
index 2055f22..3ef9684 100644
--- a/Hospital/HospitalDatabaseImplement/Models/Medicine.cs
+++ b/Hospital/HospitalDatabaseImplement/Models/Medicine.cs
@@ -22,7 +22,7 @@ namespace HospitalDatabaseImplement.Models
         public string Dose { get; private set; } = string.Empty;
 
         [Required]
-        public int ApothecaryId { get; private set; } = -1;
+        public int ApothecaryId { get; private set; }
 
         public virtual Apothecary Apothecary { get; set; }