增加 迁移回滚功能实现

server/migrations/009_createUserMessagesTable.ts

@@ -0,0 +1,27 @@
+import type { MigrationLiveDefinition } from '@d8d-appcontainer/types'
+import { DeleteStatus, MessageStatus } from "../../client/share/types.ts";
+
+const createUserMessagesTable: MigrationLiveDefinition = {
+  name: "create_user_messages_table",
+  up: async (api) => {
+    await api.schema.createTable('user_messages', (table) => {
+      table.increments('id').primary().comment('关联ID');
+      table.integer('user_id').unsigned().references('id').inTable('users').onDelete('CASCADE').comment('用户ID');
+      table.integer('message_id').unsigned().references('id').inTable('messages').onDelete('CASCADE').comment('消息ID');
+      table.integer('status').defaultTo(MessageStatus.UNREAD).comment('阅读状态(0=未读,1=已读)');
+      table.integer('is_deleted').defaultTo(DeleteStatus.NOT_DELETED).comment('删除状态(0=未删除,1=已删除)');
+      table.timestamp('read_at').nullable().comment('阅读时间');
+      table.timestamps(true, true);
+      
+      // 添加复合索引
+      table.index(['user_id', 'status']);
+      table.index(['user_id', 'is_deleted']);
+      table.unique(['user_id', 'message_id']);
+    });
+  },
+  down: async (api) => {
+    await api.schema.dropTable('user_messages');
+  }
+}
+
+export default createUserMessagesTable;