feat: 实现父表索引策略，确保仅在父表创建索引，避免子表重复索引维护

bls-rcu-action-backend/scripts/init_db.sql

@@ -38,7 +38,9 @@ ALTER TABLE rcu_action.rcu_action_events
 ALTER TABLE rcu_action.rcu_action_events
   ADD COLUMN IF NOT EXISTS loop_name VARCHAR(255);
 
--- Indexes for performance
+-- Indexes for performance (ONLY on parent partitioned table)
+-- PostgreSQL will create/attach corresponding child-partition indexes automatically.
+-- Do not create duplicated indexes on partition child tables.
 CREATE INDEX IF NOT EXISTS idx_rcu_action_hotel_id ON rcu_action.rcu_action_events (hotel_id);
 CREATE INDEX IF NOT EXISTS idx_rcu_action_room_id ON rcu_action.rcu_action_events (room_id);
 CREATE INDEX IF NOT EXISTS idx_rcu_action_device_id ON rcu_action.rcu_action_events (device_id);