增加 迁移回滚功能实现

server/migrations/008_createMessagesTable.ts

@@ -0,0 +1,25 @@
+import type { MigrationLiveDefinition } from '@d8d-appcontainer/types'
+
+const createMessagesTable: MigrationLiveDefinition = {
+  name: "create_messages_table",
+  up: async (api) => {
+    await api.schema.createTable('messages', (table) => {
+      table.increments('id').primary().comment('消息ID');
+      table.string('title').notNullable().comment('消息标题');
+      table.text('content').notNullable().comment('消息内容');
+      table.enum('type', ['system', 'private', 'announce']).notNullable().comment('消息类型');
+      table.integer('sender_id').unsigned().references('id').inTable('users').onDelete('SET NULL').comment('发送者ID');
+      table.string('sender_name').comment('发送者名称');
+      table.timestamps(true, true);
+      
+      // 添加索引
+      table.index('type');
+      table.index('sender_id');
+    });
+  },
+  down: async (api) => {
+    await api.schema.dropTable('messages');
+  }
+}
+
+export default createMessagesTable;