/usr/lib/python2.7/dist-packages/txdav/common/datastore/upgrade/sql/upgrades/ is in calendarserver 5.2+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/txdav/common/datastore/upgrade/sql/upgrades/__init__.py
/usr/lib/python2.7/dist-packages/txdav/common/datastore/upgrade/sql/upgrades/addressbook_upgrade_from_1_to_2.py
/usr/lib/python2.7/dist-packages/txdav/common/datastore/upgrade/sql/upgrades/calendar_upgrade_from_1_to_2.py
/usr/lib/python2.7/dist-packages/txdav/common/datastore/upgrade/sql/upgrades/calendar_upgrade_from_2_to_3.py
/usr/lib/python2.7/dist-packages/txdav/common/datastore/upgrade/sql/upgrades/calendar_upgrade_from_3_to_4.py
/usr/lib/python2.7/dist-packages/txdav/common/datastore/upgrade/sql/upgrades/calendar_upgrade_from_4_to_5.py
/usr/lib/python2.7/dist-packages/txdav/common/datastore/upgrade/sql/upgrades/calendar_upgrade_from_5_to_6.py
/usr/lib/python2.7/dist-packages/txdav/common/datastore/upgrade/sql/upgrades/test/
/usr/lib/python2.7/dist-packages/txdav/common/datastore/upgrade/sql/upgrades/test/__init__.py
/usr/lib/python2.7/dist-packages/txdav/common/datastore/upgrade/sql/upgrades/test/test_upgrade_from_3_to_4.py
/usr/lib/python2.7/dist-packages/txdav/common/datastore/upgrade/sql/upgrades/test/test_upgrade_from_4_to_5.py
/usr/lib/python2.7/dist-packages/txdav/common/datastore/upgrade/sql/upgrades/test/test_upgrade_from_5_to_6.py
/usr/lib/python2.7/dist-packages/txdav/common/datastore/upgrade/sql/upgrades/util.py