fix deleting show library paths

ErsatzTV.Infrastructure/Data/Configurations/Metadata/SeasonMetadataConfiguration.cs

@@ -0,0 +1,18 @@
+using ErsatzTV.Core.Domain;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ErsatzTV.Infrastructure.Data.Configurations
+{
+    public class SeasonMetadataConfiguration : IEntityTypeConfiguration<SeasonMetadata>
+    {
+        public void Configure(EntityTypeBuilder<SeasonMetadata> builder)
+        {
+            builder.ToTable("SeasonMetadata");
+
+            builder.HasMany(em => em.Artwork)
+                .WithOne()
+                .OnDelete(DeleteBehavior.Cascade);
+        }
+    }
+}

ErsatzTV.Infrastructure/Migrations/20210228003644_Add_SeasonMetadataCascade.cs

@@ -0,0 +1,37 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace ErsatzTV.Infrastructure.Migrations
+{
+    public partial class Add_SeasonMetadataCascade : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                "FK_Artwork_SeasonMetadata_SeasonMetadataId",
+                "Artwork");
+
+            migrationBuilder.AddForeignKey(
+                "FK_Artwork_SeasonMetadata_SeasonMetadataId",
+                "Artwork",
+                "SeasonMetadataId",
+                "SeasonMetadata",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                "FK_Artwork_SeasonMetadata_SeasonMetadataId",
+                "Artwork");
+
+            migrationBuilder.AddForeignKey(
+                "FK_Artwork_SeasonMetadata_SeasonMetadataId",
+                "Artwork",
+                "SeasonMetadataId",
+                "SeasonMetadata",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+        }
+    }
+}

ErsatzTV.Infrastructure/Migrations/TvContextModelSnapshot.cs

@@ -989,7 +989,8 @@ namespace ErsatzTV.Infrastructure.Migrations
 
                     b.HasOne("ErsatzTV.Core.Domain.SeasonMetadata", null)
                         .WithMany("Artwork")
-                        .HasForeignKey("SeasonMetadataId");
+                        .HasForeignKey("SeasonMetadataId")
+                        .OnDelete(DeleteBehavior.Cascade);
 
                     b.HasOne("ErsatzTV.Core.Domain.ShowMetadata", null)
                         .WithMany("Artwork")