Merge pull request #11 from SlimusMinus/add_chat

added chats with another users

src/main/java/com/krylov/refound/config/WebSocketConfig.java

@@ -1,5 +1,7 @@
 package com.krylov.refound.config;
 
+import com.krylov.refound.util.WsHandshakeInterceptor;
+import lombok.RequiredArgsConstructor;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.messaging.simp.config.MessageBrokerRegistry;
 import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
@@ -8,18 +10,22 @@ import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerCo
 
 @Configuration
 @EnableWebSocketMessageBroker
+@RequiredArgsConstructor
 public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
 
+  private final WsHandshakeInterceptor wsHandshakeInterceptor;
+
   @Override
-  public void configureMessageBroker(MessageBrokerRegistry config) {
+  public void configureMessageBroker(MessageBrokerRegistry registry) {
-    config.enableSimpleBroker("/topic");
+    registry.enableSimpleBroker("/topic");      // сервер → клиент
-    config.setApplicationDestinationPrefixes("/app");
+    registry.setApplicationDestinationPrefixes("/app"); // клиент → сервер
   }
 
   @Override
   public void registerStompEndpoints(StompEndpointRegistry registry) {
     registry.addEndpoint("/ws")
         .setAllowedOriginPatterns("*")
+        .addInterceptors(wsHandshakeInterceptor)
         .withSockJS();
   }
 }

src/main/java/com/krylov/refound/controller/ChatController.java

@@ -1,37 +1,45 @@
 package com.krylov.refound.controller;
 
-import com.krylov.refound.dto.ChatMessage;
+import com.krylov.refound.dto.*;
-import com.krylov.refound.entity.Message;
+import com.krylov.refound.service.ChatService;
-import com.krylov.refound.entity.User;
+import com.krylov.refound.service.UserService;
-import com.krylov.refound.repository.UserRepository;
-import com.krylov.refound.service.MessageService;
-import java.security.Principal;
-import java.util.Optional;
 import lombok.RequiredArgsConstructor;
-import org.springframework.messaging.handler.annotation.MessageMapping;
+import org.springframework.security.core.Authentication;
-import org.springframework.messaging.handler.annotation.Payload;
+import org.springframework.web.bind.annotation.*;
-import org.springframework.messaging.simp.SimpMessagingTemplate;
+import java.util.List;
-import org.springframework.stereotype.Controller;
 
-@Controller
+@RestController
 @RequiredArgsConstructor
+@RequestMapping("/api/v1/chats")
 public class ChatController {
-  private final MessageService service;
-  private final SimpMessagingTemplate messagingTemplate;
-  private final UserRepository userRepository;
 
+  private final UserService userService;
+  private final ChatService chatService;
 
-  @MessageMapping("/chat")
+  // Создать чат с пользователем или получить существующий
-  public void send(@Payload ChatMessage message, Principal principal) {
+  @PostMapping("/with/{otherUserId}")
+  public ChatDto createOrGetChat(@PathVariable Long otherUserId, @RequestParam(required = false) Long postId, Authentication auth) {
+    Long currentUserId = extractUserId(auth); // см. ниже как достать id
+    return chatService.getOrCreateChat(currentUserId, otherUserId, postId);
+  }
 
-    Optional<User> sender = userRepository.findByLogin(principal.getName());
+  // Список всех чатов текущего пользователя
-    Message saved = new Message();
+  @GetMapping
-    if(sender.isPresent()){
+  public List<ChatDto> getMyChats(Authentication auth) {
-      saved = service.send(message.getReceiverId(), message.getContent());
+    return chatService.getUserChats(extractUserId(auth));
-    }
+  }
 
-    // отправка получателю
+  // История сообщений конкретного чата
-    messagingTemplate.convertAndSend("/topic/messages/" + message.getReceiverId(), saved);
+  @GetMapping("/{chatId}/messages")
+  public List<MessageDto> getMessages(@PathVariable Long chatId) {
+    return chatService.getMessages(chatId);
+  }
+
+  private Long extractUserId(Authentication auth) {
+    // Подставь свою логику получения userId из JWT/Authentication
+    // Например если в токене login, а не id - подтяни через UserService
+    String login = auth.getName();
+    return userService.getUserIdByLogin(login);
   }
 
 }

src/main/java/com/krylov/refound/controller/ChatWebSocketController.java

@@ -0,0 +1,22 @@
+package com.krylov.refound.controller;
+
+import com.krylov.refound.dto.SendMessageRequest;
+import com.krylov.refound.service.ChatService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.messaging.handler.annotation.MessageMapping;
+import org.springframework.messaging.simp.SimpMessageHeaderAccessor;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequiredArgsConstructor
+public class ChatWebSocketController {
+  private final ChatService chatService;
+
+  // Клиент шлёт сюда: /app/chat.send
+  @MessageMapping("/chat.send")
+  public void sendMessage(SendMessageRequest request, SimpMessageHeaderAccessor headerAccessor) {
+    Long senderId = (Long) headerAccessor.getSessionAttributes().get("userId");
+    chatService.sendMessage(senderId, request.getChatId(), request.getContent());
+    // ChatService сам отправит сообщение всем подписчикам через messagingTemplate
+  }
+}

src/main/java/com/krylov/refound/controller/MessageController.java

@@ -1,41 +0,0 @@
-package com.krylov.refound.controller;
-
-import com.krylov.refound.dto.DialogResponse;
-import com.krylov.refound.entity.Message;
-import com.krylov.refound.service.MessageService;
-import java.util.List;
-import lombok.RequiredArgsConstructor;
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.PathVariable;
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RequestParam;
-import org.springframework.web.bind.annotation.RestController;
-
-@RestController
-@RequestMapping("/api/v1/messages")
-@RequiredArgsConstructor
-public class MessageController {
-  private final MessageService service;
-
-  @PostMapping
-  public void send(@RequestParam Long receiverId,
-      @RequestParam String content) {
-    service.send(receiverId, content);
-  }
-
-  @GetMapping("/{userId}")
-  public List<Message> chat(@PathVariable Long userId) {
-    return service.getChat(userId);
-  }
-
-  @GetMapping("/dialogs")
-  public List<DialogResponse> getDialogs() {
-    return service.getDialogs();
-  }
-
-  @PostMapping("/read/{userId}")
-  public void markAsRead(@PathVariable Long userId) {
-    service.markAsRead(userId);
-  }
-}

src/main/java/com/krylov/refound/dto/ChatDto.java

@@ -0,0 +1,16 @@
+package com.krylov.refound.dto;
+
+import java.time.LocalDateTime;
+import lombok.Data;
+
+@Data
+public class ChatDto {
+  private Long id;
+  private Long otherUserId;
+  private String otherUserName;
+  private String otherUserAvatar;
+  private Long postId;
+  private String lastMessage;
+  private LocalDateTime lastMessageAt;
+  private long unreadCount;
+}

src/main/java/com/krylov/refound/dto/CreateChatRequest.java

@@ -0,0 +1,8 @@
+package com.krylov.refound.dto;
+
+import lombok.Data;
+
+@Data
+public class CreateChatRequest {
+  private Long postId; // опционально, с каким объявлением связан чат
+}

src/main/java/com/krylov/refound/dto/MessageDto.java

@@ -0,0 +1,14 @@
+package com.krylov.refound.dto;
+
+import java.time.LocalDateTime;
+import lombok.Data;
+
+@Data
+public class MessageDto {
+  private Long id;
+  private Long chatId;
+  private Long senderId;
+  private String content;
+  private boolean isRead;
+  private LocalDateTime createdAt;
+}

src/main/java/com/krylov/refound/dto/SendMessageRequest.java

@@ -0,0 +1,9 @@
+package com.krylov.refound.dto;
+
+import lombok.Data;
+
+@Data
+public class SendMessageRequest {
+  private Long chatId;
+  private String content;
+}

src/main/java/com/krylov/refound/entity/Chat.java

@@ -0,0 +1,74 @@
+package com.krylov.refound.entity;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.PrePersist;
+import jakarta.persistence.Table;
+import jakarta.persistence.UniqueConstraint;
+import java.time.LocalDateTime;
+import java.util.Objects;
+import lombok.Data;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.Setter;
+import lombok.ToString;
+import org.hibernate.proxy.HibernateProxy;
+
+@Entity
+@Table(name = "chats", uniqueConstraints = {@UniqueConstraint(columnNames = {"user_one_id", "user_two_id"})})
+@Getter
+@Setter
+@ToString
+@RequiredArgsConstructor
+public class Chat {
+  @Id
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
+  private Long id;
+
+  @Column(name = "user_one_id", nullable = false)
+  private Long userOneId;     // всегда меньший id (для уникальности пары)
+
+  @Column(name = "user_two_id", nullable = false)
+  private Long userTwoId;     // всегда больший id
+
+  @Column(name = "post_id")
+  private Long postId;        // объявление, по поводу которого начат чат (опционально)
+
+  @Column(name = "created_at", nullable = false)
+  private LocalDateTime createdAt;
+
+  @PrePersist
+  protected void onCreate() {
+    createdAt = LocalDateTime.now();
+  }
+
+  @Override
+  public final boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null) {
+      return false;
+    }
+    Class<?> oEffectiveClass =
+        o instanceof HibernateProxy proxy ? proxy.getHibernateLazyInitializer()
+            .getPersistentClass() : o.getClass();
+    Class<?> thisEffectiveClass =
+        this instanceof HibernateProxy proxy ? proxy.getHibernateLazyInitializer()
+            .getPersistentClass() : this.getClass();
+    if (thisEffectiveClass != oEffectiveClass) {
+      return false;
+    }
+    Chat chat = (Chat) o;
+    return getId() != null && Objects.equals(getId(), chat.getId());
+  }
+
+  @Override
+  public final int hashCode() {
+    return this instanceof HibernateProxy proxy ? proxy.getHibernateLazyInitializer()
+        .getPersistentClass().hashCode() : getClass().hashCode();
+  }
+}

src/main/java/com/krylov/refound/entity/Message.java

@@ -6,6 +6,7 @@ import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
 import jakarta.persistence.ManyToOne;
+import jakarta.persistence.PrePersist;
 import jakarta.persistence.Table;
 import java.time.LocalDateTime;
 import lombok.Getter;
@@ -20,16 +21,23 @@ public class Message {
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   private Long id;
 
-  @ManyToOne
+  @Column(name = "chat_id", nullable = false)
-  private User sender;
+  private Long chatId;
 
-  @ManyToOne
+  @Column(name = "sender_id", nullable = false)
-  private User receiver;
+  private Long senderId;
 
-  @Column(length = 2000)
+  @Column(nullable = false, columnDefinition = "TEXT")
   private String content;
 
+  @Column(name = "is_read", nullable = false)
+  private boolean isRead = false;
+
+  @Column(name = "created_at", nullable = false)
   private LocalDateTime createdAt;
 
-  private boolean isRead;
+  @PrePersist
+  protected void onCreate() {
+    createdAt = LocalDateTime.now();
+  }
 }

src/main/java/com/krylov/refound/repository/ChatRepository.java

@@ -0,0 +1,16 @@
+package com.krylov.refound.repository;
+
+import com.krylov.refound.entity.Chat;
+import java.util.List;
+import java.util.Optional;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+
+public interface ChatRepository extends JpaRepository<Chat, Long> {
+
+  @Query("SELECT c FROM Chat c WHERE c.userOneId = :u1 AND c.userTwoId = :u2")
+  Optional<Chat> findByUsers(Long u1, Long u2);
+
+  @Query("SELECT c FROM Chat c WHERE c.userOneId = :userId OR c.userTwoId = :userId ORDER BY c.createdAt DESC")
+  List<Chat> findAllByUserId(Long userId); // Changed from Optional to List
+}

src/main/java/com/krylov/refound/repository/MessageRepository.java

@@ -9,48 +9,7 @@ import org.springframework.data.jpa.repository.Query;
 
 public interface MessageRepository extends JpaRepository<Message, Long> {
 
-  @Query("""
+  List<Message> findByChatIdOrderByCreatedAtAsc(Long chatId);
-          SELECT m FROM Message m
+  long countByChatIdAndIsReadFalseAndSenderIdNot(Long chatId, Long currentUserId);
-          WHERE (m.sender.id = :user1 AND m.receiver.id = :user2)
-             OR (m.sender.id = :user2 AND m.receiver.id = :user1)
-          ORDER BY m.createdAt
-      """)
-  List<Message> findChat(Long user1, Long user2);
-
-  @Query("""
-          SELECT m FROM Message m
-          WHERE m.id IN (
-              SELECT MAX(m2.id)
-              FROM Message m2
-              WHERE m2.sender.id = :userId OR m2.receiver.id = :userId
-              GROUP BY 
-                  CASE 
-                      WHEN m2.sender.id = :userId THEN m2.receiver.id
-                      ELSE m2.sender.id
-                  END
-          )
-          ORDER BY m.createdAt DESC
-      """)
-  List<Message> findDialogs(Long userId);
-
-  // 🔥 количество непрочитанных от пользователя
-  @Query("""
-          SELECT COUNT(m) FROM Message m
-          WHERE m.receiver.id = :userId
-            AND m.sender.id = :otherUserId
-            AND m.isRead = false
-      """)
-  int countUnread(Long userId, Long otherUserId);
-
-  // 🔥 пометить как прочитанные
-  @Modifying
-  @Query("""
-          UPDATE Message m
-          SET m.isRead = true
-          WHERE m.receiver.id = :userId
-            AND m.sender.id = :otherUserId
-            AND m.isRead = false
-      """)
-  void markAsRead(Long userId, Long otherUserId);
 
 }

src/main/java/com/krylov/refound/repository/UserRepository.java

@@ -3,9 +3,14 @@ package com.krylov.refound.repository;
 import com.krylov.refound.entity.User;
 import java.util.Optional;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
 
 public interface UserRepository extends JpaRepository<User, Long> {
   Optional<User> findByLogin(String email);
 
   Boolean existsByLogin(String login);
+
+  @Query("SELECT u.id FROM User u WHERE u.login = :login")
+  Optional<Long> findUserByLogin(@Param("login") String login);
 }

src/main/java/com/krylov/refound/service/ChatService.java

@@ -0,0 +1,125 @@
+package com.krylov.refound.service;
+
+import com.krylov.refound.dto.ChatDto;
+import com.krylov.refound.dto.MessageDto;
+import com.krylov.refound.entity.Chat;
+import com.krylov.refound.entity.Message;
+import com.krylov.refound.repository.ChatRepository;
+import com.krylov.refound.repository.MessageRepository;
+import com.krylov.refound.repository.UserRepository;
+import java.util.List;
+import java.util.stream.Collectors;
+import lombok.RequiredArgsConstructor;
+import org.springframework.messaging.simp.SimpMessagingTemplate;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@RequiredArgsConstructor
+public class ChatService {
+  private final ChatRepository chatRepository;
+  private final MessageRepository messageRepository;
+  private final SimpMessagingTemplate messagingTemplate;
+  private final UserRepository userRepository; // твой существующий репозиторий юзеров
+
+  // Создать чат с пользователем (или вернуть существующий)
+  @Transactional
+  public ChatDto getOrCreateChat(Long currentUserId, Long otherUserId, Long postId) {
+    if (currentUserId.equals(otherUserId)) {
+      throw new IllegalArgumentException("Нельзя создать чат с самим собой");
+    }
+
+    Long u1 = Math.min(currentUserId, otherUserId);
+    Long u2 = Math.max(currentUserId, otherUserId);
+
+    Chat chat = chatRepository.findByUsers(u1, u2)
+        .orElseGet(() -> {
+          Chat newChat = new Chat();
+          newChat.setUserOneId(u1);
+          newChat.setUserTwoId(u2);
+          newChat.setPostId(postId);
+          return chatRepository.save(newChat);
+        });
+
+    return toDto(chat, currentUserId);
+  }
+
+  // Все чаты пользователя
+  public List<ChatDto> getUserChats(Long userId) {
+    return chatRepository.findAllByUserId(userId).stream()
+        .map(c -> toDto(c, userId))
+        .collect(Collectors.toList());
+  }
+
+  // История сообщений в чате
+  public List<MessageDto> getMessages(Long chatId) {
+    return messageRepository.findByChatIdOrderByCreatedAtAsc(chatId).stream()
+        .map(this::toMessageDto)
+        .collect(Collectors.toList());
+  }
+
+  // Отправка сообщения (вызывается из WebSocket контроллера)
+  @Transactional
+  public MessageDto sendMessage(Long senderId, Long chatId, String content) {
+    Chat chat = chatRepository.findById(chatId)
+        .orElseThrow(() -> new IllegalArgumentException("Чат не найден"));
+
+    // Проверка что отправитель - участник чата
+    if (!chat.getUserOneId().equals(senderId) && !chat.getUserTwoId().equals(senderId)) {
+      throw new SecurityException("Вы не участник этого чата");
+    }
+
+    Message message = new Message();
+    message.setChatId(chatId);
+    message.setSenderId(senderId);
+    message.setContent(content);
+    message = messageRepository.save(message);
+
+    MessageDto dto = toMessageDto(message);
+
+    // Отправляем сообщение через WebSocket в топик конкретного чата
+    messagingTemplate.convertAndSend("/topic/chat/" + chatId, dto);
+
+    return dto;
+  }
+
+  private ChatDto toDto(Chat chat, Long currentUserId) {
+    Long otherUserId = chat.getUserOneId().equals(currentUserId)
+        ? chat.getUserTwoId() : chat.getUserOneId();
+
+    ChatDto dto = new ChatDto();
+    dto.setId(chat.getId());
+    dto.setOtherUserId(otherUserId);
+    dto.setPostId(chat.getPostId());
+
+    // Подтягиваем имя/аватар собеседника из твоего UserRepository
+    userRepository.findById(otherUserId).ifPresent(user -> {
+      dto.setOtherUserName(user.getName() + " " + user.getLastName());
+      dto.setOtherUserAvatar(user.getAvatarUrl());
+    });
+
+    List<Message> messages = messageRepository.findByChatIdOrderByCreatedAtAsc(chat.getId());
+    if (!messages.isEmpty()) {
+      Message last = messages.getLast();
+      dto.setLastMessage(last.getContent());
+      dto.setLastMessageAt(last.getCreatedAt());
+    }
+
+    dto.setUnreadCount(
+        messageRepository.countByChatIdAndIsReadFalseAndSenderIdNot(chat.getId(), currentUserId)
+    );
+
+    return dto;
+  }
+
+  private MessageDto toMessageDto(Message m) {
+    MessageDto dto = new MessageDto();
+    dto.setId(m.getId());
+    dto.setChatId(m.getChatId());
+    dto.setSenderId(m.getSenderId());
+    dto.setContent(m.getContent());
+    dto.setRead(m.isRead());
+    dto.setCreatedAt(m.getCreatedAt());
+    return dto;
+  }
+}

src/main/java/com/krylov/refound/service/MessageService.java

@@ -19,65 +19,5 @@ import org.springframework.transaction.annotation.Transactional;
 @Service
 @RequiredArgsConstructor
 public class MessageService {
-  private final MessageRepository messageRepository;
-  private final UserRepository userRepository;
-  private final UserService userService;
 
-  public Message send(Long receiverId, String content) {
-
-    User sender = userService.getCurrentUser();
-
-    User receiver = userRepository.findById(receiverId)
-        .orElseThrow(() -> new ApiException(ErrorCode.NOT_FOUND, "User not found", HttpStatus.NOT_FOUND));
-
-    Message message = new Message();
-    message.setSender(sender);
-    message.setReceiver(receiver);
-    message.setContent(content);
-    message.setCreatedAt(LocalDateTime.now());
-    message.setRead(false);
-
-    return messageRepository.save(message);
-  }
-
-  public List<Message> getChat(Long userId) {
-    User current = userService.getCurrentUser();
-    return messageRepository.findChat(current.getId(), userId);
-  }
-
-  public List<DialogResponse> getDialogs() {
-    Long userId = 1L;
-    List<Message> dialogs = messageRepository.findDialogs(userId);
-
-    return dialogs.stream().map(m -> {
-
-      boolean isMeSender = m.getSender().getId().equals(userId);
-
-      Long otherUserId = isMeSender
-          ? m.getReceiver().getId()
-          : m.getSender().getId();
-
-      String email = isMeSender
-          ? m.getReceiver().getLogin()
-          : m.getSender().getLogin();
-
-      int unread = messageRepository.countUnread(userId, otherUserId);
-
-      return new DialogResponse(
-          otherUserId,
-          email,
-          m.getContent(),
-          m.getCreatedAt(),
-          (long )unread
-      );
-    }).toList();
-  }
-
-  @Transactional
-  public void markAsRead(Long otherUserId) {
-
-    User current = userService.getCurrentUser();
-
-    messageRepository.markAsRead(current.getId(), otherUserId);
-  }
 }

src/main/java/com/krylov/refound/service/UserService.java

@@ -77,4 +77,9 @@ public class UserService {
         .avatar(user.getAvatarUrl())
         .build();
   }
+
+  public Long getUserIdByLogin(String login) {
+    return repository.findUserByLogin(login)
+        .orElseThrow(() -> new EntityNotFoundException("User not found"));
+  }
 }

src/main/java/com/krylov/refound/util/WsHandshakeInterceptor.java

@@ -0,0 +1,37 @@
+package com.krylov.refound.util;
+
+import com.krylov.refound.security.JwtService;
+import com.krylov.refound.service.UserService;
+import java.util.Map;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.server.ServerHttpRequest;
+import org.springframework.http.server.ServerHttpResponse;
+import org.springframework.http.server.ServletServerHttpRequest;
+import org.springframework.stereotype.Component;
+import org.springframework.web.socket.WebSocketHandler;
+import org.springframework.web.socket.server.HandshakeInterceptor;
+
+@Component
+@RequiredArgsConstructor
+public class WsHandshakeInterceptor implements HandshakeInterceptor {
+
+  private final JwtService jwtService;
+  private final UserService userService;
+
+  @Override
+  public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Map<String, Object> attributes) {
+    if (request instanceof ServletServerHttpRequest servletRequest) {
+      String token = servletRequest.getServletRequest().getParameter("token");
+      if (token != null && jwtService.isTokenValid(token)) {
+        String login = jwtService.extractLogin(token);
+        Long userId = userService.getUserIdByLogin(login);
+        attributes.put("userId", userId);
+        return true;
+      }
+    }
+    return false; // отклонить подключение без валидного токена
+  }
+
+  @Override
+  public void afterHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Exception exception) {}
+}

src/main/resources/db/changelog/create/006-create-chats.yaml

@@ -0,0 +1,17 @@
+databaseChangeLog:
+  - changeSet:
+      id: 004-create-chats-messages
+      author: you
+      changes:
+        - createTable:
+            tableName: chats
+            columns:
+              - column: { name: id, type: BIGSERIAL, constraints: { primaryKey: true } }
+              - column: { name: user_one_id, type: BIGINT, constraints: { nullable: false } }
+              - column: { name: user_two_id, type: BIGINT, constraints: { nullable: false } }
+              - column: { name: post_id, type: BIGINT }
+              - column: { name: created_at, type: TIMESTAMP, constraints: { nullable: false } }
+        - addUniqueConstraint:
+            tableName: chats
+            columnNames: user_one_id, user_two_id
+            constraintName: uq_chat_users

src/main/resources/db/changelog/create/007-recreate-messages.yaml

@@ -0,0 +1,28 @@
+databaseChangeLog:
+  - changeSet:
+      id: 005-drop-old-messages
+      author: you
+      changes:
+        - dropTable:
+            tableName: messages
+            cascadeConstraints: true
+
+  - changeSet:
+      id: 006-create-messages-new
+      author: you
+      changes:
+        - createTable:
+            tableName: messages
+            columns:
+              - column: { name: id, type: BIGSERIAL, constraints: { primaryKey: true } }
+              - column: { name: chat_id, type: BIGINT, constraints: { nullable: false } }
+              - column: { name: sender_id, type: BIGINT, constraints: { nullable: false } }
+              - column: { name: content, type: TEXT, constraints: { nullable: false } }
+              - column: { name: is_read, type: BOOLEAN, defaultValueBoolean: false }
+              - column: { name: created_at, type: TIMESTAMP, constraints: { nullable: false } }
+        - addForeignKeyConstraint:
+            baseTableName: messages
+            baseColumnNames: chat_id
+            referencedTableName: chats
+            referencedColumnNames: id
+            constraintName: fk_messages_chat