address greptile review feedback (greploop iteration 7)

- Reject zero-interval schedule_spec to prevent unbounded firing loop
- Use normalized (tz-aware) expires_at when persisting in CREATE path

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

litellm/proxy/scheduled_tasks/endpoints.py

@@ -166,7 +166,7 @@ async def create_scheduled_task(
         schedule_spec=data.schedule_spec,
         schedule_tz=data.schedule_tz,
         next_run_at=next_run_at,
-        expires_at=data.expires_at,
+        expires_at=expires_at,
         fire_once=fire_once,
     )
     return _row_to_response(row)

litellm/proxy/scheduled_tasks/schedule.py

@@ -22,7 +22,7 @@ from apscheduler.triggers.cron import (  # type: ignore[import-not-found, import
 )
 
 
-_INTERVAL_RE = re.compile(r"^\s*(\d+)\s*([smhd])\s*$", re.IGNORECASE)
+_INTERVAL_RE = re.compile(r"^\s*([1-9]\d*)\s*([smhd])\s*$", re.IGNORECASE)
 _INTERVAL_UNITS = {
     "s": "seconds",
     "m": "minutes",