databaseChangeLog:
  - changeSet:
      id: 004-create-messages
      author: you
      changes:
        - createTable:
            tableName: messages
            columns:
              - column: { name: id, type: BIGSERIAL, constraints: { primaryKey: true } }
              - column: { name: sender_id, type: BIGINT }
              - column: { name: receiver_id, type: BIGINT }
              - column: { name: content, type: TEXT }
              - column: { name: created_at, type: TIMESTAMP }
              - column: { name: is_read, type: BOOLEAN }

        - addForeignKeyConstraint:
            baseTableName: messages
            baseColumnNames: sender_id
            referencedTableName: users
            referencedColumnNames: id
            constraintName: fk_messages_sender  # ✅

        - addForeignKeyConstraint:
            baseTableName: messages
            baseColumnNames: receiver_id
            referencedTableName: users
            referencedColumnNames: id
            constraintName: fk_messages_receiver  # ✅

        # 🔥 индекс для чата
        - createIndex:
            tableName: messages
            indexName: idx_messages_users
            columns:
              - column: { name: sender_id }
              - column: { name: receiver_id }
              - column: { name: created_at }