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Oct 23, 2026

An agent ships the forward migration and forgets the way back

A coding agent writes the forward schema change, it applies on the branch, and the PR body reads 'schema updated.' The operational risk it omits lives in the reverse path, the existing rows, and the check that proves a read after the write still works. This piece lists the three missing pieces, the fixed task block that forces an agent to plan both directions, and the cheap reviewer check that catches a one-way migration before it merges.

Oct 23, 20262 min read1 reactions0 comments