Reset some rq meta fields when retrying rq job (#8719)

In the current implementation, if a job is rescheduled for later
execution (due to a `LockNotAvailableError` raised during the export
process), the job's metadata is not filtered when creating a new job.
This PR introduces RQ job metadata fields that must be reset when
rescheduling a job.

cvat/apps/dataset_manager/views.py

@@ -20,6 +20,7 @@
 from cvat.apps.engine.log import ServerLogManager
 from cvat.apps.engine.models import Job, Project, Task
 from cvat.apps.engine.utils import get_rq_lock_by_user
+from cvat.apps.engine.rq_job_handler import RQMeta
 
 from .formats.registry import EXPORT_FORMATS, IMPORT_FORMATS
 from .util import (
@@ -84,7 +85,7 @@ def _patched_retry(*_1, **_2):
                 *current_rq_job.args,
                 **current_rq_job.kwargs,
                 job_id=current_rq_job.id,
-                meta=current_rq_job.meta,
+                meta=RQMeta.reset_meta_on_retry(current_rq_job.meta),
                 job_ttl=current_rq_job.ttl,
                 job_result_ttl=current_rq_job.result_ttl,
                 job_description=current_rq_job.description,

cvat/apps/engine/rq_job_handler.py

@@ -6,12 +6,31 @@
 
 import attrs
 
-from typing import Optional, Union
+from typing import Optional, Union, Any
 from uuid import UUID
 from rq.job import Job as RQJob
 
 from .models import RequestAction, RequestTarget, RequestSubresource
 
+class RQMeta:
+    @staticmethod
+    def get_resettable_fields() -> list[RQJobMetaField]:
+        """Return a list of fields that must be reset on retry"""
+        return [
+            RQJobMetaField.FORMATTED_EXCEPTION,
+            RQJobMetaField.PROGRESS,
+            RQJobMetaField.TASK_PROGRESS,
+            RQJobMetaField.STATUS
+        ]
+
+    @classmethod
+    def reset_meta_on_retry(cls, meta_to_update: dict[RQJobMetaField, Any]) -> dict[RQJobMetaField, Any]:
+        resettable_fields = cls.get_resettable_fields()
+
+        return {
+            k: v for k, v in meta_to_update.items() if k not in resettable_fields
+        }
+
 class RQJobMetaField:
     # common fields
     FORMATTED_EXCEPTION = "formatted_exception"