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tiennm99
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Pre-execution prerequisites for the Phase 07 cutover. Stage 2 of the cutover keeps DUAL_WRITE=0 for ~6 days; if anything regresses during that window the operator MUST be able to roll back to KV/D1 with the last N days of Mongo-only writes recovered. Pre-building these scripts (per code-reviewer #4) eliminates "draft a backfill under outage pressure" — the anti-pattern of writing untested code at 4am. Reverse-backfill - scripts/backfill-mongo-to-kv.js: full-scan Mongo collection per module, PUT each doc back to CF KV via REST. expiresAt → expirationTtl (clamped to 60s minimum per CF KV); already-expired docs are skipped (won't resurrect dead state). 50 ops/sec throttle. --dry-run + --module flags. - scripts/backfill-mongo-to-d1.js: full-scan trading_trades, build INSERT SQL preserving legacy_id where present (round-trips D1 autoincrement IDs preserved by phase-05 forward backfill). Sequential int generation for any docs without legacy_id. Pipes through wrangler d1 execute. - scripts/lib/migration-helpers.js: cfKvPut helper added. Delete guard (debugger #12) - scripts/wrangler-delete-guard.sh: interactive CONFIRM wrapper around wrangler kv namespace delete + wrangler d1 delete. Exits 3 when stdin is not a tty so it cannot run in CI. Documented: never run in CI. package.json: backfill:mongo:kv[:dry] + backfill:mongo:d1[:dry] scripts wired. Tests: 697 → 733 (+36). - 7 cfKvPut tests (REST URL, querystring, body, expiration_ttl param). - 10 reverse-KV TTL math tests (expired sentinel, future seconds, no-TTL, CF 60s minimum clamp). - 9 reverse-D1 SQL construction tests (escaping, legacy_id preservation, sequential generation). Lint clean. No Worker code touched. Stage 1 cutover, 7-day soak, snapshots, and Stage 3 cleanup (delete CFKVStore + simplify factories + edit package.json deploy chain) remain operator-driven and will be committed separately after binding deletion.