anchor.diff:  
   class destructor TServerEngine.DestroyEngine;
   begin
  -  TMARSFireDAC.CloseConnectionDefs(FAvailableConnectionDefs);
  +//  TMARSFireDAC.CloseConnectionDefs(FAvailableConnectionDefs);
     FreeAndNil(FEngine);
   end;
   
  
positive.code: 
      // Application configuration
      FEngine.AddApplication('DefaultApp', '/default', [ 'Server.Resources.*']);
      FAvailableConnectionDefs := TMARSFireDAC.LoadConnectionDefs(FEngine.Parameters, 'FireDAC');
    except
      FreeAndNil(FEngine);
      raise;
  
negative.code:   TServerEngine=class
    private
      class var FEngine: TMARSEngine;
  //    class var FAvailableConnectionDefs: TArray<string>;
    public
      class constructor CreateEngine;
      class destructor DestroyEngine;
  