నువ్వు చేసిన ఒక తప్పు గురించి నాకు చెప్పు మరియు నువ్వు ఏమి నేర్చుకున్నాయో చెప్పు.

1. State the mistake plainly
2. Show you took responsibility (no deflecting)
3. Explain how you fixed or contained it
4. End with the durable lesson or habit

S: I ran a database migration on staging that I thought was prod-safe.
T: It dropped a column other code still used.
A: I immediately told the team, restored from backup, and added the column back
   with a safe migration. Then I documented the rollback steps.
R: No prod impact. Now I always test migrations on a prod-like copy and require
   a second reviewer for schema changes.