code: protected void unregisterApiContracts(Client client, Connection connection) throws SQLException {
          QueryRunner run = new QueryRunner();
          run.update(connection, "DELETE FROM contracts WHERE client_org_id = ? AND client_id = ? AND client_version = ?",  //$NON-NLS-1$
                  client.getOrganizationId(), client.getClientId(), client.getVersion());
      }
docs: Removes all of the api contracts from the database.
  @param client
  @param connection
  @throws SQLException