MangaConnectors do not have to return an Object with 6 Parameters.

Job-Start Logic readable and optimized
More robust Database design

API/APIEndpointRecords/DownloadAvailableChaptersJobRecord.cs

@@ -0,0 +1,5 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace API.APIEndpointRecords;
+
+public record DownloadAvailableChaptersJobRecord([Required]string language, [Required]ulong recurrenceTimeMs, [Required]string localLibraryId);