docs: public long selectMaxPostId() throws SQLException {
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        try {
           conn = connectionSupplier.getConnection();
           stmt = conn.createStatement();
           rs = stmt.executeQuery(selectMaxPostIdSQL);
           return rs.next() ? rs.getLong(1) : 0L;
        } finally {
           closeQuietly(conn, stmt, rs);
        }
     }