Requests table typo

Community Novice

I was stuck longer than I'm proud of this morning with a bug in my code - it turned out to be because the requests table has a column named "conversaion_id", while my code was using a more traditional spelling...

It's a minor thing, but it'd be helpful to fix it at this stage before rolling the table schemas out more widely. We're using quite a bit of introspection to copy data around, and it's easy for a typo to spread across our data pipeline and end up with errors as more people start working on it.