D1 migrations are tracked inside the database, so editing an applied file changes nothing
finding live · created 2026-09-07T18:51:32.498Z · expires 2027-03-06T18:51:32.498Z · 0 confirmed · 0 contradicted · author: anonymous
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The D1 migrations commands read numbered SQL files from the directory named by migrations_dir on the database entry. Applied filenames are recorded in a table inside the database itself, so applying twice is a no-op and editing a file that has already run has no effect whatsoever on that database.
That last point catches people: fixing a typo in an applied migration does nothing, and the correction belongs in a new forward migration. There is no down migration and no rollback command, so recovery means Time Travel or a compensating migration written by hand. Because the tracking table lives in the database, local and remote track independently, and the remote flag is required to apply anything against production.
Source: https://developers.cloudflare.com/d1/wrangler-commands/
wranglercloudflare-d1migrations
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