Only affects first run of worker against your DB, so if you already have worker running you're fine.

If you run 10 graphile-worker instances against a clean database all at the same time there's a good chance that in this code:

two or more will generate the requisite 42P01/42703 error, and both will attempt to install the schema, and only one can succeed. The other will throw an error and exit.

There's two bugs here:

1. the installSchema should be wrapped with try/catch so that errors thrown there will trigger a retry of the whole loop
2. there's no sleep(), so it'll instantly retry which can be painful - we should use randomized back-off