feat: improve SQL query formatting and add type hints for better clarity

scripts/backtest_replay.py

@@ -19,12 +19,10 @@ def _resolve_fee_rate(fee_rate: float | None, db_path: str | None = None) -> flo
     if db_path is not None:
         try:
             conn = duckdb.connect(db_path)
-            row = conn.execute(
-                """
+            row = conn.execute("""
                 SELECT maker_fee FROM kraken_account_snapshots
                 ORDER BY snapshot_at DESC LIMIT 1
-            """
-            ).fetchone()
+            """).fetchone()
             conn.close()
             if row is not None and row[0] is not None:
                 return float(row[0])

scripts/benchmark_metrics_compute.py

@@ -13,13 +13,11 @@ from arbitrade.storage.db import DuckDBStore
 
 def _python_scan_compute(store: DuckDBStore) -> tuple[float, float | None, float | None]:
     with store.connect() as conn:
-        trade_rows = conn.execute(
-            """
+        trade_rows = conn.execute("""
             SELECT started_at, finished_at, realized_pnl
             FROM trades
             WHERE finished_at IS NOT NULL
-            """
-        ).fetchall()
+            """).fetchall()
         opportunity_rows = conn.execute("SELECT detected_at FROM opportunities").fetchall()
 
     realized = sum(float(row[2]) for row in trade_rows if row[2] is not None)