feat: v0.2.4 惰性扫描 + 写背压 + 内存预算 + ANALYZE + 加密 + Savepoint + 在线备份

src/engine/interface.ts

@@ -65,4 +65,20 @@ export interface IStorageEngine {
 
   /** 回滚事务 */
   rollbackTransaction(): Promise<void>;
+
+  // ---- Savepoint (可选) ----
+
+  /** 创建 Savepoint */
+  savepoint?(name: string): Promise<void>;
+
+  /** 回滚到 Savepoint */
+  rollbackToSavepoint?(name: string): Promise<void>;
+
+  /** 释放 Savepoint */
+  releaseSavepoint?(name: string): Promise<void>;
+
+  // ---- 备份 (可选) ----
+
+  /** 在线备份：导出全库一致性快照 */
+  backup?(): Promise<Record<string, Record<string, unknown>[]>>;
 }