fix: scope transactional locks to primary records

backend/apps/tickets/services.py

@@ -493,7 +493,11 @@ def update_ticket_fields(
     if unknown_fields:
         raise TicketDataError(f"不允许修改字段: {', '.join(sorted(unknown_fields))}")
 
-    ticket = Ticket.objects.select_for_update().select_related("category").get(id=ticket.id)
+    ticket = (
+        Ticket.objects.select_for_update(of=("self",))
+        .select_related("category")
+        .get(id=ticket.id)
+    )
     evidence_by_field = evidence_by_field or {}
     confidence_by_field = confidence_by_field or {}
     before: dict = {}
@@ -841,7 +845,7 @@ def adopt_solution_for_ticket(
     if locked_solution.status != "published":
         raise TicketDataError("只能采纳已发布的解决方案")
     locked_ticket = (
-        Ticket.objects.select_for_update()
+        Ticket.objects.select_for_update(of=("self",))
         .select_related("category", "resolution")
         .get(id=ticket.id)
     )