diff --git a/src/storage/mod.rs b/src/storage/mod.rs
index a209c33..ac7fb3b 100644
--- a/src/storage/mod.rs
+++ b/src/storage/mod.rs
@@ -779,31 +779,6 @@ impl SessionStore {
         Ok(scope_keys)
     }
 
-    pub fn list_memory_scope_keys_updated_since(
-        &self,
-        scope_kind: &str,
-        since_timestamp: i64,
-    ) -> Result<Vec<String>, StorageError> {
-        let conn = self.conn.lock().expect("session db mutex poisoned");
-        let mut stmt = conn.prepare(
-            "
-            SELECT DISTINCT scope_key
-            FROM memories
-            WHERE scope_kind = ?1 AND updated_at > ?2
-            ORDER BY scope_key ASC
-            ",
-        )?;
-
-        let rows = stmt.query_map(params![scope_kind, since_timestamp], |row| {
-            row.get::<_, String>(0)
-        })?;
-        let mut scope_keys = Vec::new();
-        for row in rows {
-            scope_keys.push(row?);
-        }
-        Ok(scope_keys)
-    }
-
     pub fn list_memories_for_scope(
         &self,
         scope_kind: &str,
@@ -2368,50 +2343,4 @@ mod tests {
         assert_eq!(fetched.completed_at, Some(1_700_000_000_100));
     }
 
-    #[test]
-    fn test_list_memory_scope_keys_updated_since_filters_recent_scopes() {
-        let store = SessionStore::in_memory().unwrap();
-
-        let first = store
-            .put_memory(&MemoryUpsert {
-                scope_kind: "user".to_string(),
-                scope_key: "feishu:user-1".to_string(),
-                namespace: "profile".to_string(),
-                memory_key: "work".to_string(),
-                content: "用户在做AI产品".to_string(),
-                source_type: "message".to_string(),
-                source_session_id: None,
-                source_message_id: None,
-                source_message_seq: None,
-                source_channel_name: None,
-                source_chat_id: None,
-            })
-            .unwrap();
-
-        let cutoff = first.updated_at;
-
-        std::thread::sleep(std::time::Duration::from_millis(2));
-
-        store
-            .put_memory(&MemoryUpsert {
-                scope_kind: "user".to_string(),
-                scope_key: "feishu:user-2".to_string(),
-                namespace: "preferences".to_string(),
-                memory_key: "style".to_string(),
-                content: "偏好简洁表达".to_string(),
-                source_type: "message".to_string(),
-                source_session_id: None,
-                source_message_id: None,
-                source_message_seq: None,
-                source_channel_name: None,
-                source_chat_id: None,
-            })
-            .unwrap();
-
-        let recent_scope_keys = store
-            .list_memory_scope_keys_updated_since("user", cutoff)
-            .unwrap();
-
-        assert_eq!(recent_scope_keys, vec!["feishu:user-2".to_string()]);
-    }
 }