Rehearse a live-app schema change + backfill on a snapshot-seeded preview deployment, verify, then promote the proven change to prod with the snapshot as rollback.
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A schema push on Convex validates every existing document against the new schema and FAILS the push if any row doesn't conform — a real data-conformance gate. The safe way to use that gate is to let it fail on a rehearsal copy, not on prod. This capability turns a preview deployment into that copy: seed it with a prod snapshot, push the new schema + run the backfill there, watch the gate, and only promote once it's green. It composes deploy-guard (target classification), migrate (the optional-then-tighten pattern), and @convex-dev/migrations (the batched, resumable backfill).
CONVEX_DEPLOY_KEY before any --preview-create/--preview-name deploy — a plain npx convex login session cannot create previews, and this is a paid-tier feature. If no preview key is available, fall back to rehearsing on the personal dev deployment seeded with the snapshot, and say so.npx convex export --path snapshot.zip (from the deployment holding the real data; add --include-file-storage only if the migration touches files). This is a read; it changes nothing.npx convex deploy --preview-create migrate-<slug> (needs the preview key; auto-expires ~5 days). Seed it: npx convex import snapshot.zip --deployment migrate-<slug> (import targets a deployment by NAME with --deployment; there is no --preview-name flag on import). The import succeeds because the data still matches the old schema.npx convex deploy --preview-name migrate-<slug> (re-deploys to the SAME preview, keeping its data; NOT convex dev, which targets personal dev): (a) make the new/changed field OPTIONAL and deploy — if existing rows violate it the push FAILS HERE on the copy with the offending shape; fix and re-push until green. (b) write a @convex-dev/migrations backfill and run it against the preview; verify every row is now valid. (c) tighten the validator (required / narrowed union) and deploy again — the gate now passes because the backfill ran.run/runOneoffQuery pointed at the preview, or a smoke query) to confirm behavior and shape.npx convex import snapshot.zip --replace --prod); state plainly that data written after the snapshot is lost, so keep the promote window short.deploy --preview-name, import targets it with --deployment.No reviews yet. Tell others what you thought.
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