Beyond 'users', what other common relations might trigger a similar 'relation does not exist' error, and what's the general takeaway?

Any table, view, or sequence name can trigger this error if it's not found. Common examples include `relation products does not exist`, `relation orders does not exist`, `relation sessions does not exist`, or even system tables like `relation pg_authid does not exist` if querying incorrectly. The general takeaway is that the database engine is trying to locate a named object and cannot find it within its current context (database, schema, search path), pointing to a mismatch between what the application expects and what the database actually contains.