When using watchPg, the schema stop being updated automatically after a few minutes
### Summary

I'm using option watchPg (set to true). When I start Graphile, the schema gets updated automatically at the beginning. But after a few minutes, it stops being updated and I see no error in Graphile logs.

- Have you seen this before?
- Have you an idea on how I can see some logs about what's happened to give me a clue?

### Additional context

The issue occurred when using Graphile and Postgres in two different containers.
I tried without containers (with Postgres and Graphile on the same server), and I don't have this issue.

