remove orphan media items and prevent duplicate paths

ErsatzTV.Infrastructure/Data/Configurations/MediaItem/MediaItemConfiguration.cs

@@ -11,6 +11,9 @@ namespace ErsatzTV.Infrastructure.Data.Configurations
             builder.ToTable("MediaItem");
 
             builder.OwnsOne(c => c.Statistics).WithOwner();
+
+            builder.HasIndex(i => i.Path)
+                .IsUnique();
         }
     }
 }

ErsatzTV.Infrastructure/Migrations/20210227001213_Add_MediaItemPathIndex.cs

@@ -0,0 +1,41 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace ErsatzTV.Infrastructure.Migrations
+{
+    public partial class Add_MediaItemPathIndex : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            // delete orphan movies, if any exist
+            migrationBuilder.Sql(
+                @"DELETE FROM MediaItem WHERE Id IN
+                (SELECT mi.Id FROM Library l
+                INNER JOIN LibraryPath lp ON l.Id = lp.LibraryId
+                INNER JOIN MediaItem mi ON lp.Id = mi.LibraryPathId
+                LEFT OUTER JOIN Movie m ON mi.Id = m.Id
+                WHERE l.MediaKind = 1 AND m.Id IS NULL)");
+
+            // delete orphan episodes, if any exist
+            migrationBuilder.Sql(
+                @"DELETE FROM MediaItem WHERE Id IN
+                (SELECT mi.Id FROM Library l
+                INNER JOIN LibraryPath lp ON l.Id = lp.LibraryId
+                INNER JOIN MediaItem mi ON lp.Id = mi.LibraryPathId
+                LEFT OUTER JOIN Show s ON mi.Id = s.Id
+                LEFT OUTER JOIN Season ssn ON mi.Id = ssn.Id
+                LEFT OUTER JOIN Episode e ON mi.Id = e.Id
+                WHERE l.MediaKind = 2 AND s.Id IS NULL AND ssn.Id IS NULL AND e.Id IS NULL)");
+
+            migrationBuilder.CreateIndex(
+                "IX_MediaItem_Path",
+                "MediaItem",
+                "Path",
+                unique: true);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder) =>
+            migrationBuilder.DropIndex(
+                "IX_MediaItem_Path",
+                "MediaItem");
+    }
+}

ErsatzTV.Infrastructure/Migrations/TvContextModelSnapshot.cs

@@ -326,6 +326,9 @@ namespace ErsatzTV.Infrastructure.Migrations
 
                     b.HasIndex("LibraryPathId");
 
+                    b.HasIndex("Path")
+                        .IsUnique();
+
                     b.ToTable("MediaItem");
                 });