{
                "sourceFileUrl" : string,        // source file location
                "type" : string,                 // "image" | "video" | "audio"
                "source" : string,
                "author" : string,
                "licence" : string,
                "oryginalFileName" : string,                
                "userAccepted" : string,         // "yes" | "no"
                "titleEn" : string,
                "descriptionEn" : string,
                "imageWidth" : int,
                "imageHeight" : int,
                "group" : string,
                "order" : int
              }
              

              {
                "type" : string, // "image" | "video" | "audio"
                "source" : string,
                "author" : string,
                "licence" : string,
                "meta" : [
                  {
                    "name" : string ☆,
                    "language" : string ☆,
                    "value" : string,
                  },
                  ( ... )                    
                ],
                "entity" : [
                  {
                    "entity" : string ☆,
                    "idEntity" : string ☆,
                    "order" : int,
                    "group" : string
                  },
                  (...)
                ]
                
              }
              

            'entity-relation' - delete relation to entity.
            'entity-relation-and-db' - delete relation to entity and media and mediaMeta if there is olny one entity connected to it.
            

            'force-all' - delete all media data and all connentions to entities.