Sequence reached maximum value
Postgres. At 09:14 every INSERT into the `events` table began failing with `nextval: reached maximum value of sequence "events_id_seq" (2147483647)`. The table's `id` is the primary key. Writes to this one table are fully down; reads are fine. The table has billions of historical rows (many since deleted). There was no deploy. Triage, restore writes with minimal downtime, and prevent recurrence on other tables.
What a strong answer looks like
Stop the bleeding first (mitigate), then form hypotheses from real signals. Separate root cause from symptom, communicate status as you go, and close with what prevents a repeat.
0:00 of about 35 min
Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.
Run or narrate your approach, then ask the coach.