fix: defer npc_positions indexes + fallback to older backup on latest blob loss

npc_trading.py

@@ -240,6 +240,8 @@ async def init_trading_db(db_path: str):
         """)
         await db.execute("CREATE INDEX IF NOT EXISTS idx_pos_agent ON npc_positions(agent_id, status)")
         await db.execute("CREATE INDEX IF NOT EXISTS idx_pos_ticker ON npc_positions(ticker, status)")
+        await db.execute("CREATE INDEX IF NOT EXISTS idx_pos_closed ON npc_positions(status, closed_at)")
+        await db.execute("CREATE INDEX IF NOT EXISTS idx_pos_agent_closed ON npc_positions(agent_id, status, closed_at)")
 
         # ★ 레버리지 컬럼 마이그레이션
         try:
@@ -2019,4 +2021,5 @@ async def get_npc_trade_history(db_path: str, agent_id: str) -> Dict:
             'username': npc[0], 'identity': npc[1], 'mbti': npc[2], 'gpu': round(npc[3] or 0, 1),
             'trades': trades,
             'total_trades': len(trades),
-        }
+        }
+