Fixed a bug where a series with a relationship couldn't be deleted. (#1495)

API/Data/DataContext.cs

@@ -72,7 +72,9 @@ namespace API.Data
             builder.Entity<SeriesRelation>()
                 .HasOne(pt => pt.TargetSeries)
                 .WithMany(t => t.RelationOf)
-                .HasForeignKey(pt => pt.TargetSeriesId);
+                .HasForeignKey(pt => pt.TargetSeriesId)
+                .OnDelete(DeleteBehavior.ClientCascade);
+
 
             builder.Entity<AppUserPreferences>()
                 .Property(b => b.BookThemeName)

API/Data/Repositories/SeriesRepository.cs

@@ -484,6 +484,7 @@ public class SeriesRepository : ISeriesRepository
             .Include(s => s.Volumes)
             .Include(s => s.Metadata)
             .ThenInclude(m => m.CollectionTags)
+            .Include(s => s.Relations)
             .Where(s => seriesIds.Contains(s.Id))
             .AsSplitQuery()
             .ToListAsync();