fix(rls): 收斂 API DB access context

apps/api/src/services/decision_manager.py

@@ -1933,14 +1933,14 @@ class DecisionManager:
         try:
             from src.core.feature_flags import aiops_flags as _p6_flags
             if _p6_flags.is_sub_flag_enabled("AIOPS_P6_SELF_DEMOTION"):
-                from src.db.base import get_session_factory as _p6_sf
+                from src.db.base import get_db_context as _p6_db_context
                 from src.db.models import AiGovernanceEvent as _GovernanceEvent
                 from sqlalchemy import select as _p6_select, func as _p6_func
                 from datetime import timedelta as _p6_td
 
                 _now = __import__("src.utils.timezone", fromlist=["now_taipei"]).now_taipei()
 
-                async with _p6_sf()() as _p6_sess:
+                async with _p6_db_context() as _p6_sess:
                     # 過去 7 天有幾筆未解決的 slo_violation？
                     _viol_7d_q = await _p6_sess.execute(
                         _p6_select(_p6_func.count()).where(
@@ -1980,8 +1980,8 @@ class DecisionManager:
                     )
                     # 記錄保守模式事件
                     try:
-                        from src.db.base import get_session_factory as _p6_sf2
-                        async with _p6_sf2()() as _s2:
+                        from src.db.base import get_db_context as _p6_db_context2
+                        async with _p6_db_context2() as _s2:
                             _s2.add(_GovernanceEvent(
                                 event_type="conservative_mode",
                                 details={
@@ -2021,8 +2021,8 @@ class DecisionManager:
                             _push_decision_to_telegram(incident, token.proposal_data)
                         )
                         try:
-                            from src.db.base import get_session_factory as _p6_sf3
-                            async with _p6_sf3()() as _s3:
+                            from src.db.base import get_db_context as _p6_db_context3
+                            async with _p6_db_context3() as _s3:
                                 _s3.add(_GovernanceEvent(
                                     event_type="self_demotion",
                                     details={