Importer db

I'd like to start thinking about which parts of the code would be shared between various potential importers, and which parts are specific to the asana export importer. I feel like the format of the lines of the export are clearly specific, but I'm not sure about the sqlite db, I think that might be important in all worlds. Does that seem true to you? If so, it'd be worth protecting the sqlite db from knowing about the details of the asana export's format.