/usr/lib/ghc-doc/hoogle/libghc-relational-query-hdbc-doc.txt is in libghc-relational-query-hdbc-doc 0.6.4.2-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-relational-query-hdbc-doc/html/relational-query-HDBC.txt