fix(scraper): 补_room_watermarks函数定义(增量同步时引用但定义在编辑中丢失,导致群消息扫描崩溃)

Co-Authored-By: Claude <noreply@anthropic.com>

yunke-server/scripts/scrape_via_page.py

@@ -571,6 +571,20 @@ async def _discover_conversations(channel: str, voice_channel: str) -> list[tupl
     return fresh + known
 
 
+async def _room_watermarks() -> dict[str, int]:
+    """每群本地最新消息时间(ms)——群消息增量水位(按 room_id)。"""
+    from app.db.base import async_engine
+    from sqlalchemy import text as sa_text
+
+    async with async_engine.connect() as conn:
+        result = await conn.execute(sa_text(
+            "SELECT room_id, max(timestamp) FROM message "
+            "WHERE room_id IS NOT NULL AND room_id != '' "
+            "GROUP BY room_id"
+        ))
+        return {r[0]: r[1] or 0 for r in result.fetchall()}
+
+
 async def _conversation_watermarks(channel: str) -> dict[tuple[str, str], int]:
     """每对话的本地最新消息时间(ms)——增量同步水位。"""
     from app.db.base import async_engine