Make rating data optional

Use HTML to enfore at least one of the two fields has a value, but I don't want to require both

src/app/database/migrations/2025-06-22_18-32-57_create_songratings.zig

@@ -7,9 +7,9 @@ pub fn up(repo: anytype) !void {
         "songratings",
         &.{
             t.primaryKey("id", .{}),
-            t.column("song", .bigint, .{ .reference = .{ "albumsongs", "id" } }),
-            t.column("rating", .smallint, .{}),
-            t.column("rating_text", .text, .{}),
+            t.column("song", .bigint, .{ .reference = .{ "songs", "id" } }),
+            t.column("rating", .smallint, .{ .optional = true }),
+            t.column("rating_text", .text, .{ .optional = true }),
             t.column("date", .datetime, .{}),
             t.timestamps(.{}),
         },