Add Binance Testnet exchange gateway

tests/test_database.py

@@ -1,3 +1,4 @@
+import sqlite3
 from pathlib import Path
 
 from llm_trade_bot.database import Database
@@ -35,3 +36,44 @@ async def test_run_lifecycle(tmp_path: Path):
         assert last["summary"] == "idle"
     finally:
         await database.close()
+
+
+async def test_managed_orders_migrate_legacy_rows_to_bybit(tmp_path: Path):
+    path = tmp_path / "legacy.db"
+    connection = sqlite3.connect(path)
+    connection.execute(
+        """
+        CREATE TABLE managed_orders (
+            order_link_id TEXT PRIMARY KEY, order_id TEXT, category TEXT NOT NULL,
+            symbol TEXT NOT NULL, side TEXT NOT NULL, status TEXT NOT NULL,
+            expires_at TEXT, trailing_distance TEXT, raw_json TEXT NOT NULL, updated_at TEXT NOT NULL
+        )
+        """
+    )
+    connection.execute(
+        """
+        INSERT INTO managed_orders VALUES (
+            'ltb-old', 'old-1', 'linear', 'BTCUSDT', 'Buy', 'Created',
+            '2000-01-01T00:00:00+00:00', NULL, '{}', '2000-01-01T00:00:00+00:00'
+        )
+        """
+    )
+    connection.commit()
+    connection.close()
+
+    database = Database(path)
+    await database.open()
+    try:
+        rows = await database.expired_managed_orders(provider="bybit")
+        assert rows == [
+            {
+                "order_link_id": "ltb-old",
+                "order_id": "old-1",
+                "provider": "bybit",
+                "category": "linear",
+                "symbol": "BTCUSDT",
+            }
+        ]
+        assert await database.expired_managed_orders(provider="binance") == []
+    finally:
+        await database.close()