fix(db): 知识库 V2 菜单迁移 — PL/pgSQL 安全检查 sys_menu 存在性

迁移 168 引用 sys_menu 表但在无基础 ERP 数据的数据库中不存在。
改用 DO $$ block + information_schema 检查，表不存在时安全跳过。

crates/erp-server/migration/src/m20260527_000168_ai_knowledge_v2_menu.rs

@@ -6,56 +6,65 @@ pub struct Migration;
 #[async_trait::async_trait]
 impl MigrationTrait for Migration {
     async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
-        // 在"AI 知识库"同级位置添加"知识库 V2"菜单
+        // 安全插入：仅在 sys_menu 表存在且有 ai-knowledge 菜单时添加 V2 菜单
-        // parent_id 取旧 ai-knowledge 菜单的 parent_id
         let sql = r#"
-            INSERT INTO sys_menu (id, parent_id, name, path, icon, sort, permission, component, is_external, is_cached, status, visible, created_at, updated_at, deleted_at)
+            DO $$
-            SELECT
+            BEGIN
-                gen_random_uuid(),
+                IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_schema = 'public' AND table_name = 'sys_menu') THEN
-                parent_id,
+                    INSERT INTO sys_menu (id, parent_id, name, path, icon, sort, permission, component, is_external, is_cached, status, visible, created_at, updated_at, deleted_at)
-                '知识库 V2',
+                    SELECT
-                '/health/ai-knowledge-v2',
+                        gen_random_uuid(),
-                'DatabaseOutlined',
+                        parent_id,
-                54,
+                        '知识库 V2',
-                'ai.knowledge.list',
+                        '/health/ai-knowledge-v2',
-                'ai/KnowledgeV2Page',
+                        'DatabaseOutlined',
-                false,
+                        54,
-                false,
+                        'ai.knowledge.list',
-                'active',
+                        'ai/KnowledgeV2Page',
-                true,
+                        false,
-                now(),
+                        false,
-                now(),
+                        'active',
-                NULL
+                        true,
-            FROM sys_menu
+                        now(),
-            WHERE path = '/health/ai-knowledge' AND deleted_at IS NULL
+                        now(),
-            LIMIT 1
+                        NULL
-            ON CONFLICT DO NOTHING
+                    FROM sys_menu
+                    WHERE path = '/health/ai-knowledge' AND deleted_at IS NULL
+                    LIMIT 1
+                    ON CONFLICT DO NOTHING;
+
+                    IF FOUND THEN
+                        INSERT INTO sys_role_menu (role_id, menu_id)
+                        SELECT r.id, m.id
+                        FROM sys_role r, sys_menu m
+                        WHERE r.code = 'admin' AND r.deleted_at IS NULL
+                          AND m.path = '/health/ai-knowledge-v2' AND m.deleted_at IS NULL
+                        ON CONFLICT DO NOTHING;
+                    END IF;
+                END IF;
+            END;
+            $$ LANGUAGE plpgsql
         "#;
 
         manager.get_connection().execute_unprepared(sql).await?;
 
-        // 绑定到 admin 角色
-        let role_sql = r#"
-            INSERT INTO sys_role_menu (role_id, menu_id)
-            SELECT r.id, m.id
-            FROM sys_role r, sys_menu m
-            WHERE r.code = 'admin' AND r.deleted_at IS NULL
-              AND m.path = '/health/ai-knowledge-v2' AND m.deleted_at IS NULL
-            ON CONFLICT DO NOTHING
-        "#;
-
-        manager
-            .get_connection()
-            .execute_unprepared(role_sql)
-            .await?;
-
         Ok(())
     }
 
     async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
         manager
             .get_connection()
-            .execute_unprepared("DELETE FROM sys_menu WHERE path = '/health/ai-knowledge-v2'")
+            .execute_unprepared(
+                r#"
+                DO $$
+                BEGIN
+                    IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_schema = 'public' AND table_name = 'sys_menu') THEN
+                        DELETE FROM sys_menu WHERE path = '/health/ai-knowledge-v2';
+                    END IF;
+                END;
+                $$ LANGUAGE plpgsql
+                "#,
+            )
             .await?;
         Ok(())
     }