/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/ 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/sql_schema/old/postgres-dialect/v10.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v11.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v12.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v13.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v14.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v15.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v16.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v17.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v18.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v19.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v20.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v21.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v22.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v23.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v24.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v25.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v26.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v27.sql
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/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v5.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v6.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v7.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v8.sql
/usr/lib/python2.7/dist-packages/txdav/common/datastore/sql_schema/old/postgres-dialect/v9.sql