backend support record playback history

pkg/database/method_playback.go

@@ -0,0 +1,7 @@
+package database
+
+func (database *Database) RecordPlayback(playback Playback) error {
+	_, err := database.stmt.recordPlaybackStmt.Exec(
+		playback.UserID, playback.FileID, playback.Time, playback.Method, playback.Duration)
+	return err
+}