Unverified50% confidenceFactExact time
The expand and contract pattern splits a single database change into four phases: expand (add the new column), backfill (copy data and dual-write), migrate reads (deploy code that reads the new column), contract (drop the old column).
1
Sources
50%
Confidence
Long-term
Relevance
10/16/2026
First Seen
Sources
Database Migrations That Can Roll Back at 2 AM
rss10/16/2026
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