/usr/share/dbconfig-common/data/serendipity/ is in serendipity 1.5.3-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/dbconfig-common/data/serendipity/install/
/usr/share/dbconfig-common/data/serendipity/install/mysql
/usr/share/dbconfig-common/data/serendipity/install/pgsql
/usr/share/dbconfig-common/data/serendipity/install/sqlite
/usr/share/dbconfig-common/data/serendipity/install/sqlite3
/usr/share/dbconfig-common/data/serendipity/upgrade/
/usr/share/dbconfig-common/data/serendipity/upgrade/mysql/
/usr/share/dbconfig-common/data/serendipity/upgrade/mysql/1.1.2-1
/usr/share/dbconfig-common/data/serendipity/upgrade/mysql/1.2-1
/usr/share/dbconfig-common/data/serendipity/upgrade/mysql/1.5.2-1
/usr/share/dbconfig-common/data/serendipity/upgrade/pgsql/
/usr/share/dbconfig-common/data/serendipity/upgrade/pgsql/1.1.2-1
/usr/share/dbconfig-common/data/serendipity/upgrade/pgsql/1.2-1
/usr/share/dbconfig-common/data/serendipity/upgrade/pgsql/1.5.2-1
/usr/share/dbconfig-common/data/serendipity/upgrade/sqlite/
/usr/share/dbconfig-common/data/serendipity/upgrade/sqlite/1.1.2-1
/usr/share/dbconfig-common/data/serendipity/upgrade/sqlite/1.2-1
/usr/share/dbconfig-common/data/serendipity/upgrade/sqlite/1.5.2-1