Used JQuery and AJAX to submit form data, and load dynamically in the div I want in the browser with the partial template.
Request images with listings
Added crawlerhistory to db.
Switched to Postgresql, added DATABASE_URL to activate script so Heroku can find it when I deploy. Sqlite is the default.
Needed to configure varchar limitations for Postgresql. Tracking timestamp in Listings, but no longer has relationship to crawlhistory, because it would prevent me from adding to the DB without making a crawl.