Initial drafts for Smart Playlists

db/migration/20211008205505_add_smart_playlist.go

@@ -0,0 +1,37 @@
+package migrations
+
+import (
+	"database/sql"
+
+	"github.com/pressly/goose"
+)
+
+func init() {
+	goose.AddMigration(upAddSmartPlaylist, downAddSmartPlaylist)
+}
+
+func upAddSmartPlaylist(tx *sql.Tx) error {
+	_, err := tx.Exec(`
+alter table playlist
+	add column rules varchar null;
+alter table playlist
+	add column evaluated_at datetime null;
+create index if not exists playlist_evaluated_at
+	on playlist(evaluated_at);
+
+create table playlist_fields (
+    field varchar(255) not null, 
+	playlist_id varchar(255) not null
+		constraint playlist_fields_playlist_id_fk
+			references playlist
+				on update cascade on delete cascade
+);
+create unique index playlist_fields_idx
+	on playlist_fields (field, playlist_id);
+`)
+	return err
+}
+
+func downAddSmartPlaylist(tx *sql.Tx) error {
+	return nil
+}