Simplify pairlock querying

freqtrade/commands/db_commands.py

@@ -36,7 +36,7 @@ def start_convert_db(args: Dict[str, Any]) -> None:
 
     session_target.commit()
 
-    for pairlock in PairLock.query:
+    for pairlock in PairLock.get_all_locks():
         pairlock_count += 1
         make_transient(pairlock)
         session_target.add(pairlock)

freqtrade/persistence/pairlock.py

@@ -56,6 +56,10 @@ class PairLock(ModelBase):
 
         return PairLock.session.scalars(select(PairLock).filter(*filters))
 
+    @staticmethod
+    def get_all_locks() -> ScalarResult['PairLock']:
+        return PairLock.session.scalars(select(PairLock))
+
     def to_json(self) -> Dict[str, Any]:
         return {
             'id': self.id,

freqtrade/persistence/pairlock_middleware.py

@@ -172,6 +172,6 @@ class PairLocks():
         Return all locks, also locks with expired end date
         """
         if PairLocks.use_db:
-            return PairLock.session.scalars(select(PairLock)).all()
+            return PairLock.get_all_locks().all()
         else:
             return PairLocks.locks

freqtrade/persistence/trade_model.py

@@ -1607,12 +1607,13 @@ class Trade(ModelBase, LocalTrade):
         NOTE: Not supported in Backtesting.
         :returns: Tuple containing (pair, profit_sum)
         """
-        trading_volume = Order.query.with_entities(
+        trading_volume = Trade.session.execute(
+            select(
                 func.sum(Order.cost).label('volume')
             ).filter(
                 Order.order_filled_date >= start_date,
                 Order.status == 'closed'
-        ).scalar()
+            )).scalar_one()
         return trading_volume
 
     @staticmethod