/usr/lib/ghc-doc/hoogle/persistent-postgresql.txt is in libghc-persistent-postgresql-doc 1.2.1-1build5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-persistent-postgresql-doc/html/persistent-postgresql.txt