Fix concurrent on userStrategies

src/Managing.Application.Abstractions/Repositories/ITradingRepository.cs

@@ -26,6 +26,7 @@ public interface ITradingRepository
     Task<IEnumerable<Position>> GetPositionsAsync(PositionInitiator positionInitiator);
     Task<IEnumerable<Position>> GetPositionsByStatusAsync(PositionStatus positionStatus);
     Task<IEnumerable<Position>> GetPositionsByInitiatorIdentifierAsync(Guid initiatorIdentifier);
+    Task<IEnumerable<Position>> GetPositionsByInitiatorIdentifiersAsync(IEnumerable<Guid> initiatorIdentifiers);
     Task<IEnumerable<Position>> GetAllPositionsAsync();
 
     Task UpdateScenarioAsync(Scenario scenario);