Heka has two special directories, a `base_dir` (or working dir) and a `share_dir` (see the last two items here: http://hekad.readthedocs.org/en/latest/config/index.html#global-configuration-options). Heka should have write access to the base_dir, read only access to the share_dir. Rather than hard-coding the full path, it's a better idea to use one of these as the base default location for your files. In this case share_dir would probably be the right choice, since I don't think we want Heka scribbling on the database file at all.