docs: public boolean deleteUser(final long userId) throws SQLException {
  
        Connection conn = null;
        PreparedStatement stmt = null;
        try {
           conn = connectionSupplier.getConnection();
           stmt = conn.prepareStatement(deleteUserSQL);
           stmt.setLong(1, userId);
           return stmt.executeUpdate() > 0;
        } finally {
           SQLUtil.closeQuietly(conn, stmt);
        }
     }