diff --git a/src/main/java/com/webproglabs/lab1/models/Comment.java b/src/main/java/com/webproglabs/lab1/models/Comment.java
new file mode 100644
index 0000000..1b42c97
--- /dev/null
+++ b/src/main/java/com/webproglabs/lab1/models/Comment.java
@@ -0,0 +1,82 @@
+package com.webproglabs.lab1.models;
+
+import javax.persistence.*;
+import java.util.Objects;
+
+@Entity
+public class Comment {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+
+    private String text;
+
+    @ManyToOne()
+    private User owner;
+
+    @ManyToOne()
+    private Post post;
+
+    public Comment(){};
+    public Comment(String text, User owner, Post post) {
+        this.text = text;
+        this.owner = owner;
+        this.post = post;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getText() {
+        return text;
+    }
+
+    public void setText(String text) {
+        this.text = text;
+    }
+
+    public User getOwner() {
+        return owner;
+    }
+
+    public void setOwner(User owner) {
+        this.owner.getComments().remove(this);
+        this.owner = owner;
+        if (!owner.getComments().contains(this)) {
+            owner.getComments().add(this);
+        }
+    }
+
+    public Post getPost() {return post; }
+
+    public void setPost(Post post) {
+        this.post.getComments().remove(this);
+        this.post = post;
+        if (!post.getComments().contains(this)) {
+            post.getComments().add(this);
+        }
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Comment comment = (Comment) o;
+        return Objects.equals(id, comment.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    public String ToString() {
+        return "Comment{" +
+                "id=" + id +
+                ", text='" + text + '\'' +
+                ", owner='" + owner.ToString() + '\'' +
+                ", post='" + post.ToString() + '\'' +
+                '}';
+    }
+}
diff --git a/src/main/java/com/webproglabs/lab1/models/Post.java b/src/main/java/com/webproglabs/lab1/models/Post.java
new file mode 100644
index 0000000..20b20ab
--- /dev/null
+++ b/src/main/java/com/webproglabs/lab1/models/Post.java
@@ -0,0 +1,97 @@
+package com.webproglabs.lab1.models;
+
+import javax.persistence.*;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+@Entity
+public class Post {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+
+    private String text;
+
+    @OneToMany(mappedBy = "post", orphanRemoval = true, fetch = FetchType.EAGER)
+    private List<Comment> comments = new ArrayList<Comment>();
+
+    @ManyToOne()
+    private User author;
+
+    @ManyToOne()
+    private Topic topic;
+
+    public Post(){}
+    public Post(String text, User author, Topic topic) {
+        this.text = text;
+        this.author = author;
+        this.topic = topic;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getText() {
+        return text;
+    }
+
+    public void setText(String text) {
+        this.text = text;
+    }
+
+    public User getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(User author) {
+        this.author.getPosts().remove(this);
+        this.author = author;
+        if (!author.getPosts().contains(this)) {
+            author.getPosts().add(this);
+        }
+    }
+
+    public Topic getTopic() {
+        return topic;
+    }
+
+    public void setTopic(Topic topic) {
+        this.topic.getPosts().remove(this);
+        this.topic = topic;
+        if (!topic.getPosts().contains(this)) {
+            topic.getPosts().add(this);
+        }
+    }
+
+    public List<Comment> getComments() { return comments; }
+
+    public void addComment(Comment comment) {
+        this.comments.add(comment);
+        if (comment.getPost() != this) {
+            comment.setPost(this);
+        }
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Post post = (Post) o;
+        return Objects.equals(id, post.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    public String ToString() {
+        return "Post{" +
+                "id=" + id +
+                ", text='" + text + '\'' +
+                ", author='" + author.ToString() + '\'' +
+                '}';
+    }
+}
diff --git a/src/main/java/com/webproglabs/lab1/models/Topic.java b/src/main/java/com/webproglabs/lab1/models/Topic.java
new file mode 100644
index 0000000..5415714
--- /dev/null
+++ b/src/main/java/com/webproglabs/lab1/models/Topic.java
@@ -0,0 +1,77 @@
+package com.webproglabs.lab1.models;
+
+import javax.persistence.*;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+@Entity
+public class Topic {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    private String name;
+    private String description;
+
+    @OneToMany(mappedBy = "topic", orphanRemoval = true, fetch = FetchType.EAGER)
+    private List<Post> posts;
+
+    public Topic(String name, String description) {
+        this.name = name;
+        this.description = description;
+        this.posts = new ArrayList<Post>();
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public List<Post> getPosts() {
+        return posts;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public void addPost(Post post) {
+        this.posts.add(post);
+        if (post.getTopic() != this) {
+            post.setTopic(this);
+        }
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Topic topic = (Topic) o;
+        return Objects.equals(id, topic.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    public String ToString() {
+        return "Topic{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", description='" + description + '\'' +
+                '}';
+    }
+}
diff --git a/src/main/java/com/webproglabs/lab1/models/User.java b/src/main/java/com/webproglabs/lab1/models/User.java
new file mode 100644
index 0000000..162cece
--- /dev/null
+++ b/src/main/java/com/webproglabs/lab1/models/User.java
@@ -0,0 +1,106 @@
+package com.webproglabs.lab1.models;
+
+import javax.persistence.*;
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.Size;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+@Entity
+@Table(name="users")
+public class User {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+
+    @Column(nullable = false, unique = true, length = 64)
+    @NotBlank
+    @Size(min = 3, max = 64)
+    private String login;
+
+    @Column(nullable = false, length = 64)
+    @NotBlank
+    @Size(min = 6, max = 64)
+    private String password;
+
+    private UserRole role;
+
+    @OneToMany(mappedBy = "owner", orphanRemoval = true, fetch = FetchType.EAGER)
+    private List<Comment> comments = new ArrayList<Comment>();
+
+    @OneToMany(mappedBy = "author", orphanRemoval = true, fetch = FetchType.EAGER)
+    private List<Post> posts = new ArrayList<Post>();
+
+    public User(){}
+    public User(String login, String password) {
+        this.login = login;
+        this.password=password;
+        this.role = UserRole.USER;
+    };
+
+    public User(String login, String password, UserRole role) {
+        this.login = login;
+        this.password=password;
+        this.role = role;
+    };
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getLogin() {
+        return login;
+    }
+
+    public void setLogin(String login) {
+        this.login = login;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public List<Comment> getComments() { return comments; }
+
+    public List<Post> getPosts() {return posts; }
+
+    public void addComment(Comment comment) {
+        this.comments.add(comment);
+        if (comment.getOwner() != this) {
+            comment.setOwner(this);
+        }
+    }
+
+    public void addPost(Post post) {
+        this.posts.add(post);
+        if (post.getAuthor() != this) {
+            post.setAuthor(this);
+        }
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        User user = (User) o;
+        return Objects.equals(id, user.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    public String ToString() {
+        return "User{" +
+                "id=" + id +
+                ", login='" + login + '\'' +
+                ", password='" + password + '\'' +
+                '}';
+    }
+}
diff --git a/src/main/java/com/webproglabs/lab1/models/UserRole.java b/src/main/java/com/webproglabs/lab1/models/UserRole.java
new file mode 100644
index 0000000..ec4d06a
--- /dev/null
+++ b/src/main/java/com/webproglabs/lab1/models/UserRole.java
@@ -0,0 +1,20 @@
+package com.webproglabs.lab1.models;
+
+import org.springframework.security.core.GrantedAuthority;
+
+public enum UserRole implements GrantedAuthority {
+    ADMIN,
+    USER;
+
+    private static final String PREFIX = "ROLE_";
+
+    @Override
+    public String getAuthority() {
+        return PREFIX + this.name();
+    }
+
+    public static final class AsString {
+        public static final String ADMIN = PREFIX + "ADMIN";
+        public static final String USER = PREFIX + "USER";
+    }
+}