@Override
    public void unsetDisabledStatus(String username) {
        Connection con = null;
        PreparedStatement pstmt = null;
        try {
            con = DbConnectionManager.getConnection();
            pstmt = con.prepareStatement(DELETE_FLAG);
            pstmt.setString(1, username);
            pstmt.executeUpdate();
        }
        catch (SQLException sqle) {
            // Nothing to do.
        }
        finally {
            DbConnectionManager.closeConnection(pstmt, con);
        }
    }
Default provider deletes existing flag from ofUserFlag table.
@see org.jivesoftware.openfire.lockout.LockOutProvider#unsetDisabledStatus(String)
xmppserver/src/main/java/org/jivesoftware/openfire/lockout/DefaultLockOutProvider.java