Their seems to be a spelling error in the tools field of RunUrl model, in the crawler app. the related name of the tools field says "crawer_runs" instead of "crawler_runs". This is safe for now because we have not tried accessing RunUrl model instances through the tools model instance (couldn't find any place in the codebase where we called "crawer_runs"), but can be a future source of confusion.
Ideally "crawer_runs" should be renamed to "crawler_runs" and a new migration made to reflect that.