fix: scope transactional locks to primary records

backend/apps/tickets/support_analysis.py

@@ -508,7 +508,7 @@ def process_support_analysis_result(run: AgentRun) -> TicketSupportAnalysis | No
     if run.definition.code != SUPPORT_AGENT_CODE or run.status != "succeeded":
         return None
     analysis = (
-        TicketSupportAnalysis.objects.select_for_update()
+        TicketSupportAnalysis.objects.select_for_update(of=("self",))
         .select_related(
             "ticket__category",
             "ticket__resolution",
@@ -583,7 +583,11 @@ def process_support_analysis_result(run: AgentRun) -> TicketSupportAnalysis | No
 def start_ticket_support_analysis(ticket: Ticket, *, created_by=None) -> TicketSupportAnalysis:
     """为工单创建唯一活动分析并投递绑定正式 Agent 版本的运行。"""
 
-    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)
+    )
     if ticket.archived_at is not None:
         raise SupportAnalysisError("已归档工单不能启动支持分析")
     if ticket.status in {"resolved", "closed"}: