fix: prevent re-triggering pending jobs while already running

Track running job IDs to avoid creating duplicate Skyvern tasks
when the pending check runs faster than the task completes.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cron/scheduler.py

@@ -41,6 +41,7 @@ class CronScheduler:
         )
         self._pipelines: dict[str, dict] = {}  # id -> pipeline data
         self._pipeline_tasks: dict[str, asyncio.Task] = {}  # id -> scheduler task
+        self._running_jobs: set[str] = set()  # job IDs currently executing
 
     async def start(self):
         """Start the scheduler background loops."""
@@ -85,8 +86,9 @@ class CronScheduler:
             data = resp.json()
 
         for job in data.get("jobs", []):
-            if job.get("lastStatus") == "pending":
+            if job.get("lastStatus") == "pending" and job["id"] not in self._running_jobs:
                 logger.info("Pending trigger: %s", job["name"])
+                self._running_jobs.add(job["id"])
                 asyncio.create_task(self._run_once(job))
 
     async def _pipeline_sync_loop(self):
@@ -235,6 +237,8 @@ class CronScheduler:
                 "status": "error",
                 "error": str(exc),
             })
+        finally:
+            self._running_jobs.discard(job_id)
 
     async def _report_result(self, job_id: str, result: dict):
         """Report job execution result back to the portal."""