Add OAuth token refresh retries, status persistence, and alert payloads

backend/services/scheduler/utils/oauth_token_task_loader.py

@@ -3,7 +3,7 @@ OAuth Token Monitoring Task Loader
 Functions to load due OAuth token monitoring tasks from database.
 """
 
-from datetime import datetime
+from datetime import datetime, timedelta
 from typing import List, Optional, Union
 from sqlalchemy.orm import Session
 from sqlalchemy import and_, or_
@@ -52,3 +52,34 @@ def load_due_oauth_token_monitoring_tasks(
     
     return query.all()
 
+
+def load_near_expiry_oauth_token_tasks(
+    db: Session,
+    refresh_horizon_hours: int = 24,
+    user_id: Optional[Union[str, int]] = None
+) -> List[OAuthTokenMonitoringTask]:
+    """
+    Load OAuth tasks that should run token refresh logic soon.
+
+    Includes:
+    - tasks with a scheduled retry now due (next_retry_at <= now)
+    - tasks whose routine check is inside the near-expiry horizon window
+    """
+    now = datetime.utcnow()
+    horizon = now + timedelta(hours=max(refresh_horizon_hours, 1))
+
+    query = db.query(OAuthTokenMonitoringTask).filter(
+        and_(
+            OAuthTokenMonitoringTask.status.in_(['active', 'failed', 'degraded']),
+            or_(
+                OAuthTokenMonitoringTask.next_retry_at <= now,
+                OAuthTokenMonitoringTask.next_check <= horizon,
+                OAuthTokenMonitoringTask.next_check.is_(None)
+            )
+        )
+    )
+
+    if user_id is not None:
+        query = query.filter(OAuthTokenMonitoringTask.user_id == str(user_id))
+
+    return query.all()