/usr/share/dbconfig-common/ is in icinga2-ido-pgsql 2.6.0-2+deb9u1.
This file is owned by root:root, with mode 0o755.
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/usr/share/dbconfig-common/data/
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/install/
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/install/pgsql
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/upgrade/
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/upgrade/pgsql/
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/upgrade/pgsql/2.0.2
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/upgrade/pgsql/2.1.0
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/upgrade/pgsql/2.2.0
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/upgrade/pgsql/2.3.0
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/upgrade/pgsql/2.4.0
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/upgrade/pgsql/2.5.0
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/upgrade/pgsql/2.6.0