fixed tests

backend/app/utils/scheduler_lock.py

@@ -46,6 +46,7 @@ import time
 from typing import Any
 
 import aiosqlite
+
 from app.utils.logging_compat import get_logger
 
 log = get_logger(__name__)
@@ -133,12 +134,10 @@ async def acquire_scheduler_lock(db: aiosqlite.Connection) -> bool:
         await db.execute("BEGIN IMMEDIATE")
 
         # Clean up stale locks first (heartbeat timeout exceeded)
-        cursor = await db.execute(
-            "SELECT pid, heartbeat_at, heartbeat_timeout FROM scheduler_lock WHERE id = 1"
-        )
+        cursor = await db.execute("SELECT pid, heartbeat_at, heartbeat_timeout FROM scheduler_lock WHERE id = 1")
         row = await cursor.fetchone()
 
-        if row is not None:
+        if row and len(row) == 3:
             lock_pid, lock_heartbeat, lock_timeout = row
             if lock_pid == pid:
                 # Same process re-acquiring - allowed (refresh)
@@ -202,9 +201,7 @@ async def acquire_scheduler_lock(db: aiosqlite.Connection) -> bool:
         return False
 
     except Exception as e:
-        raise RuntimeError(
-            f"Failed to acquire scheduler lock due to database error: {e}"
-        ) from e
+        raise RuntimeError(f"Failed to acquire scheduler lock due to database error: {e}") from e
 
 
 async def release_scheduler_lock(db: aiosqlite.Connection) -> None:
@@ -372,9 +369,7 @@ async def get_lock_health(db: aiosqlite.Connection) -> dict[str, Any]:
 
     stale_reason: str | None = None
     if is_stale_result:
-        stale_reason = (
-            f"heartbeat_age ({heartbeat_age:.1f}s) > timeout ({info['heartbeat_timeout']:.1f}s)"
-        )
+        stale_reason = f"heartbeat_age ({heartbeat_age:.1f}s) > timeout ({info['heartbeat_timeout']:.1f}s)"
 
     return {
         "has_lock": True,