[WEB-4440] fix: duplicate sequence when creating multiple workitems in rapid succession (#8298)

- Replace advisory lock with transaction-level lock in Issue model save method
- Updated the save method in the Issue model to use a transaction-level advisory lock for better concurrency control.
- Simplified the locking mechanism by removing the explicit unlock step, as the lock is automatically released at the end of the transaction.
- Maintained existing functionality for sequence and sort order management while improving code clarity.

apps/api/plane/db/models/issue.py

@@ -207,15 +207,15 @@ class Issue(ProjectBaseModel):
 
         if self._state.adding:
             with transaction.atomic():
-                # Create a lock for this specific project using an advisory lock
+                # Create a lock for this specific project using a transaction-level advisory lock
                 # This ensures only one transaction per project can execute this code at a time
+                # The lock is automatically released when the transaction ends
                 lock_key = convert_uuid_to_integer(self.project.id)
 
                 with connection.cursor() as cursor:
-                    # Get an exclusive lock using the project ID as the lock key
-                    cursor.execute("SELECT pg_advisory_lock(%s)", [lock_key])
+                    # Get an exclusive transaction-level lock using the project ID as the lock key
+                    cursor.execute("SELECT pg_advisory_xact_lock(%s)", [lock_key])
 
-                try:
                 # Get the last sequence for the project
                 last_sequence = IssueSequence.objects.filter(project=self.project).aggregate(
                     largest=models.Max("sequence")
@@ -236,10 +236,6 @@ class Issue(ProjectBaseModel):
                 super(Issue, self).save(*args, **kwargs)
 
                 IssueSequence.objects.create(issue=self, sequence=self.sequence_id, project=self.project)
-                finally:
-                    # Release the lock
-                    with connection.cursor() as cursor:
-                        cursor.execute("SELECT pg_advisory_unlock(%s)", [lock_key])
         else:
             # Strip the html tags using html parser
             self.description_stripped = (