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feat(ingest): accept Hookdeck-forwarded deliveries, and reject stale inbound Linear events - #6799
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Groundwork for putting a queue in front of this endpoint, not a fix for a failure anyone has reported. A write we push to Linear returns to us as a webhook, and the mirror applies it unconditionally. Today that is close to harmless: the echo only overwrites if a second edit lands in the second or two before it arrives, and it is largely self-correcting, because that second edit pushes too and its own echo repairs the damage moments later. The case that does not self-correct — two echoes arriving out of order, the stale one landing last — is rare enough over direct delivery that there is no evidence of it happening. Both of those protections are properties of low, ordered latency, and a gateway removes them. Queue depth widens the window from seconds to however far behind the consumer is, minutes on a retry, and at-least-once delivery makes reordering routine rather than exceptional. The guard has to exist before deliveries can be delayed and reordered, not after. Records Linear's own updatedAt on every outbound write and refuses any inbound event that is not strictly newer, which covers the echo and the reordering with one comparison. Checked ahead of the branchName fetch so a suppressed event costs no Linear API call, and again in the upsert's setWhere, because that read can go stale before the write lands and two deliveries for one issue can race. Compared column-to-column against excluded rather than a bound parameter, so no second timestamp conversion can disagree with the first. Rows predating the column have a null watermark and are always applied, so existing tasks adopt one on their next event. Claude-Session: https://claude.ai/code/session_014D6wif8HDRCXEFf5Ku4w7V
Adds verification for a Hookdeck-forwarded delivery and wires it into the Linear webhook ahead of Linear's own check. Both paths stay live: anything arriving without an x-hookdeck-signature verifies exactly as it did before, so a cutover is repointing a URL and a rollback needs no deploy. Linear is the route that needs this. Its signature covers a timestamp and the SDK enforces Linear's ±60s replay window, while Hookdeck preserves the original signature and timestamp when it retries — so re-checking Linear's signature behind a queue would reject every retry, which is precisely the delivery a gateway exists to save. Hookdeck's own signature is HMAC-SHA256 over the body alone and survives any delay. GitHub needs no equivalent change: its signature covers no timestamp, so it already tolerates arbitrary retry latency. x-hookdeck-verified is checked alongside the signature and is not redundant. The signature proves Hookdeck sent this; the flag proves Hookdeck authenticated the provider before forwarding. Without it, a source whose verification was never configured would hand us whatever anyone posted to its URL, correctly signed by Hookdeck and indistinguishable from real traffic. The secret is optional so environments without Hookdeck keep booting, but a signed delivery arriving somewhere it is unset is rejected rather than trusted — the alternative is trusting a header anyone can send. Claude-Session: https://claude.ai/code/session_014D6wif8HDRCXEFf5Ku4w7V
GitHub Secrets are where runtime env originates in this repo — the deploy workflows map them into the environment the Vercel CLI reads, so a variable that is not listed here is never populated no matter what the schema says. Without it the Hookdeck branch would be unreachable in every environment and every delivery would quietly fall through to provider verification, which is the failure that looks like nothing being wrong. ci.yml needs no change: lint, typecheck and test never read it, and the schema marks it optional so a build without it still succeeds. Claude-Session: https://claude.ai/code/session_014D6wif8HDRCXEFf5Ku4w7V
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Included review availability: Your plan provides up to 10 included reviews per hour; 1 remains after this review. 📝 WalkthroughWalkthroughLinear webhook handling now supports verified Hookdeck deliveries and filters stale or echoed events by provider update time. Deployment workflows pass the Hookdeck secret, and the tasks schema stores the external timestamp. ChangesLinear webhook synchronization
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The PR adds stale-event protection, but outbound Linear task updates can still write timestamps without the same guard, allowing older task data to overwrite newer data when deliveries are reordered or retried. This bounded data-correctness issue should be fixed or explicitly accepted before merge. Sequence Diagram(s)sequenceDiagram
participant Hookdeck
participant LinearWebhook
participant TasksDatabase
Hookdeck->>LinearWebhook: Deliver verified Linear webhook
LinearWebhook->>TasksDatabase: Read externalUpdatedAt
TasksDatabase-->>LinearWebhook: Return stored timestamp
LinearWebhook->>TasksDatabase: Upsert newer task state
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In `@apps/api/src/app/api/integrations/linear/jobs/sync-task/route.ts`:
- Line 164: Add a null-or-strictly-older externalUpdatedAt predicate to the
tasks update containing externalUpdatedAt, so it only writes when the existing
timestamp is null or older than the outbound response; otherwise leave the row
unchanged.
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.github/workflows/deploy-preview.yml.github/workflows/deploy-production.ymlapps/api/src/app/api/integrations/linear/jobs/sync-task/route.tsapps/api/src/app/api/integrations/linear/webhook/route.tsapps/api/src/env.tsapps/api/src/lib/webhooks/hookdeck.tsapps/api/src/lib/webhooks/verify.tspackages/db/drizzle/0091_tasks_external_updated_at.sqlpackages/db/drizzle/meta/0091_snapshot.jsonpackages/db/drizzle/meta/_journal.jsonpackages/db/src/schema/schema.ts
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The fixture spells out every column of TaskWithStatus, so adding one to the schema breaks it. Caught by CI rather than locally because the root typecheck spans 37 packages and I had only run the two I touched. Claude-Session: https://claude.ai/code/session_014D6wif8HDRCXEFf5Ku4w7V
CodeRabbit caught a hole in the guard two commits back. The outbound update wrote externalUpdatedAt unconditionally, so the watermark was not actually monotonic and the inbound guard was only as good as the value it compares against. The push goes out through QStash and can be retried, so its response can land after a webhook that already recorded something newer. Writing ours unconditionally then drags the watermark backwards, and the next stale delivery sails through the check that exists to stop it — the original bug, reachable by a slightly longer route. Gates the update on the same null-or-strictly-older predicate the inbound upsert uses. Skipping the write costs nothing: the webhook that overtook us already set lastSyncedAt and cleared syncError on its way past. Left the create path alone. A task being pushed to Linear for the first time has no watermark, so every write there is an increase, and gating it would risk dropping the external id linkage for no gain. Claude-Session: https://claude.ai/code/session_014D6wif8HDRCXEFf5Ku4w7V
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Good catch on the outbound watermark — confirmed and fixed in Verified the concern is reachable: Gated the update on the same null-or-strictly-older predicate. Nothing is lost when it skips — the webhook that overtook it already set Left the create path unguarded deliberately: a task pushed to Linear for the first time has no watermark, so every write there is an increase, and gating it would risk dropping the external id linkage for no benefit. |
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Groundwork for routing webhook ingest through Hookdeck. Nothing here changes behaviour until a Hookdeck source actually exists — every delivery still arrives directly from the provider and verifies exactly as it does today.
Why
Hookdeck was chosen over building an ack-then-process gateway ourselves: at current volume it is roughly cost-neutral against the Vercel compute it displaces, and it buys burst absorption, retries, replay and a DLQ without a multi-week build. The full assessment is here.
Two things have to be true before any traffic moves, and both are in this PR.
1. Linear's ±60s replay window would reject every retry
parseVerifiedPayloadhands Linear'swebhookTimestampto the SDK, which enforces Linear's ±60 second replay window. Hookdeck preserves the original provider signature and timestamp when it retries — so a delivery retried five minutes later arrives with a timestamp well outside the window and 401s permanently, on every attempt. The failure is silent, total, and lands precisely on the deliveries a gateway exists to save.verifyHookdeckDeliverychecksx-hookdeck-signatureinstead — HMAC-SHA256 over the raw body with no timestamp component, so it survives any delay.x-hookdeck-verifiedis checked alongside it and is not redundant: the signature proves Hookdeck sent the request, the flag proves Hookdeck authenticated the provider first. Without it, a source whose verification was never configured would forward whatever anyone posted to its URL, correctly signed and indistinguishable from real traffic.GitHub needs no equivalent change — its signature covers no timestamp, so it already tolerates arbitrary retry latency. That makes it the right provider to pilot first.
2. The mirror applies stale inbound events
A write we push to Linear returns as a webhook and the mirror applies it unconditionally. This is not a reported failure and there is no evidence of it happening — the window is a second or two, and it is largely self-correcting because the second edit pushes too and its own echo repairs the damage.
But both of those protections are properties of low, ordered latency, which is exactly what a gateway removes. Queue depth widens the window to minutes on a retry, and at-least-once delivery makes reordering routine. The guard has to exist before deliveries can be delayed and reordered, not after.
Recording Linear's
updatedAton every outbound write and refusing anything not strictly newer covers the echo and the reordering with one comparison.Verified
Provisioned a real Hookdeck source and pushed signed traffic through it rather than trusting the documentation:
x-github-deliveryforwards byte-identical — the whole dedup story rests on thisX-Hookdeck-Verified: trueX-Hookdeck-Signatureexactly, and the real delivery passes end-to-end through the verifierAlso confirmed the rendered SQL for the conflict guard (
"tasks"."external_updated_at" < excluded.external_updated_at, timestamps binding as ISO-8601 UTC) rather than assuming it.Not covered
HOOKDECK_SIGNING_SECRETis set from a trial project and must be rotated when a production project existsX-Hookdeck-Attempt-Countrather than our ownretryCounthttps://claude.ai/code/session_014D6wif8HDRCXEFf5Ku4w7V
Summary by cubic
Accepts Hookdeck-forwarded Linear webhooks and rejects stale or echoed Linear events. Old: we revalidated Linear’s ±60s timestamped signature and applied every event; New: we accept
x-hookdeck-signatureplusx-hookdeck-verified(retry-safe), persistexternal_updated_at, ignore events not strictly newer, and gate outbound updates so the watermark only moves forward. Behavior is unchanged until traffic routes via Hookdeck.x-hookdeck-signatureis absent, we verify Linear’s signature as before. Rollback is URL repoint only.HOOKDECK_SIGNING_SECRETin each environment; workflows pass it through. Signed but unverified/mismatched Hookdeck deliveries 401.0091_tasks_external_updated_at. Existing rows start null and adopt a watermark on their next event.updatedAton writes and webhooks; outbound updates only advance the watermark (null-or-strictly-older), and inbound upserts gate on recency via SQLsetWhere. GitHub webhook behavior is unchanged.Written for commit 3898a58. Summary will update on new commits.
Summary by CodeRabbit
New Features
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