Make sure transactions are reset

closes #5719

freqtrade/rpc/api_server/deps.py

@@ -1,5 +1,6 @@
 from typing import Any, Dict, Optional
 
+from freqtrade.persistence import Trade
 from freqtrade.rpc.rpc import RPC, RPCException
 
 from .webserver import ApiServer
@@ -14,6 +15,7 @@ def get_rpc_optional() -> Optional[RPC]:
 def get_rpc() -> Optional[RPC]:
     _rpc = get_rpc_optional()
     if _rpc:
+        Trade.query.session.rollback()
         return _rpc
     else:
         raise RPCException('Bot is not in the correct state')