Fix scrobble error spam in the logs.

Relates to #2831 and #2975

db/migration/20240426202913_add_id_to_scrobble_buffer.go

@@ -0,0 +1,30 @@
+package migrations
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/pressly/goose/v3"
+)
+
+func init() {
+	goose.AddMigrationContext(upAddIdToScrobbleBuffer, downAddIdToScrobbleBuffer)
+}
+
+func upAddIdToScrobbleBuffer(ctx context.Context, tx *sql.Tx) error {
+	_, err := tx.ExecContext(ctx, `
+delete from scrobble_buffer where user_id <> '';
+alter table scrobble_buffer add id varchar not null default '';
+create unique index scrobble_buffer_id_ix
+    on scrobble_buffer (id);
+`)
+	return err
+}
+
+func downAddIdToScrobbleBuffer(ctx context.Context, tx *sql.Tx) error {
+	_, err := tx.ExecContext(ctx, `
+drop index scrobble_buffer_id_ix;
+alter table scrobble_buffer drop id;
+`)
+	return err
+}