As I found out, the problem is in the postgrest settings. Namely, the application schema is not included in the settings for working through postgrest. I managed to fix this by adding the following to the compose.yaml for postgrest:
environment:
- PGRST_DB_SCHEMAS=workspace_xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx, public, postgrest
where is workspace_xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx - the schema of your application in the tooljet_db database
I haven't found how to make the setting work with all the new apps, so I'll have to add settings for each app. it works for: