fix: scheduler memory 128Mi→256Mi, fix backfill script SQL param bug

scripts/backfill_snapshot_prices.py

@@ -18,6 +18,7 @@ import argparse
 import asyncio
 import os
 import sys
+from datetime import timedelta
 
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
@@ -42,8 +43,8 @@ FROM market_snapshots
 WHERE ticker = $1
   AND snapshot_type = 'bar'
   AND data->>'c' IS NOT NULL
-  AND captured_at >= $2 - INTERVAL '24 hours'
-  AND captured_at <= $2
+  AND captured_at >= $2
+  AND captured_at <= $3
 ORDER BY captured_at DESC
 LIMIT 1
 """
@@ -102,8 +103,9 @@ async def backfill(dry_run: bool = False) -> None:
         price: float | None = None
 
         # Fallback 1: market_snapshots within 24h of generated_at
+        window_start = generated_at - timedelta(hours=24)
         market_row = await pool.fetchrow(
-            _MARKET_SNAPSHOT_FALLBACK_SQL, ticker, generated_at
+            _MARKET_SNAPSHOT_FALLBACK_SQL, ticker, window_start, generated_at
         )
         if market_row and market_row["close"] is not None:
             price = float(market_row["close"])