/usr/include/pqxx/trigger is in libpqxx3-dev 3.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19  | /*-------------------------------------------------------------------------
 *
 *   FILE
 *	pqxx/trigger
 *
 *   DESCRIPTION
 *      Obsolete header from libpqxx 1.x/2.x.  Include notify-listen instead.
 *   pqxx::trigger was replaced with pqxx::notify_listener
 *
 * Copyright (c) 2001-2008, Jeroen T. Vermeulen <jtv@xs4all.nl>
 *
 * See COPYING for copyright license.  If you did not receive a file called
 * COPYING with this source code, please notify the distributor of this mistake,
 * or contact the author.
 *
 *-------------------------------------------------------------------------
 */
// Actual definitions in .hxx file so editors and such recognize file type
#include "pqxx/trigger.hxx"
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