/usr/lib/ghc-doc/hoogle/libghc-haskelldb-hdbc-sqlite3-doc.txt is in libghc-haskelldb-hdbc-sqlite3-doc 2.1.2-7build1.
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It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-haskelldb-hdbc-sqlite3-doc/html/haskelldb-hdbc-sqlite3.txt