初始化：记忆系统源代码上传（已脱敏）

- 排除 .env / *.bak / 内部运维文档（README_INTERNAL.html）
- config.py 默认密码已替换为占位符 CHANGE_ME_*
- init_db.sql 移除生产数据库用户 GRANT 段
- README.html 数据库用户名已脱敏
- 保留：源码 + 公网 API 文档 + 建表 SQL（无授权语句）

lifecycle/cleaner.py

@@ -0,0 +1,43 @@
+"""Memory Cleaner - Periodic cleanup of old/low-importance memories"""
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+class MemoryCleaner:
+    """Clean up old, low-importance memories."""
+
+    def __init__(self, mysql_store):
+        self.mysql = mysql_store
+
+    def cleanup(self, team_id: str = None, max_age_days: int = 90,
+                min_importance: float = 0.2) -> dict:
+        """
+        Remove old memories with low importance scores.
+
+        Args:
+            team_id: If set, only clean this team's memories
+            max_age_days: Remove memories older than this
+            min_importance: Remove memories with importance below this
+
+        Returns:
+            Dict with counts of deleted memories
+        """
+        personal_deleted = self.mysql.cleanup_personal_memories(
+            team_id=team_id,
+            max_age_days=max_age_days,
+            min_importance=min_importance,
+        )
+        team_deleted = self.mysql.cleanup_team_memories(
+            team_id=team_id,
+            max_age_days=max_age_days,
+            min_importance=min_importance,
+        )
+
+        result = {
+            "personal_deleted": personal_deleted,
+            "team_deleted": team_deleted,
+            "total_deleted": personal_deleted + team_deleted,
+        }
+        logger.info(f"Cleanup result: {result}")
+        return result