Round 3 fixes: cancelled polling, aggregator invalid_count, filter state, scheduler atomicity, HTTP exception handler, tests

app/core/execution/job.py

@@ -154,6 +154,10 @@ class ValidateAllJob(Job):
             self._touch()
 
         payload = {"total": total, "submitted": submitted}
-        self._set_completed(payload)
+        if self.is_cancelled:
+            self.status = JobStatus.CANCELLED
+            self._touch()
+        else:
+            self._set_completed(payload)
         logger.info(f"ValidateAllJob {self.id}: submitted {submitted}/{total} proxies")
         return payload