Point-in-Time Recovery
WAL-based recovery, Supabase PITR, and how to recover to right before the disaster.
Your nightly backup ran at 2 AM. At 4:47 PM, someone ran a DELETE statement without a WHERE clause and wiped out the entire customers table. If you restore from the backup, you get the data as it was at 2 AM — but you lose everything that happened between 2 AM and 4:47 PM. Fourteen hours of new customers, updated profiles, and business activity, gone.
Point-in-time recovery (PITR) solves this problem. Instead of restoring to a fixed backup time, you can restore to any specific moment — like 4:46 PM, one minute before the disaster. You keep every change that happened during the day and only lose the one bad operation.
This is possible because of the Write-Ahead Log (WAL) — and understanding how it works is one of the most valuable things you can learn about databases.
How the
This lesson is part of the Guild Member curriculum. Plans start at $29/mo.