clear expired sessions on server start

why wasn't i doing this before?? 😭

controller/session.go

@@ -188,3 +188,7 @@ func DeleteSession(db *sqlx.DB, token string) error {
     return err
 }
 
+func DeleteExpiredSessions(db *sqlx.DB) error {
+    _, err := db.Exec("DELETE FROM session WHERE expires_at<current_timestamp")
+    return err
+}