## Context
Upgrading `twenty-last-contact` on a production workspace failed with a
Cloudflare error 1015 ("You are being rate limited"). The
`backfill-last-contact` post-install function runs on every version
upgrade and fired 20 concurrent update mutations per batch with no pause
between batches, on top of paginated full-collection reads. On a
workspace with real email/calendar history that burst trips Cloudflare's
rate limit, and since the client SDK throws on any non-2xx response, a
single 429 killed the whole install/upgrade hook mid-backfill.
## Changes
- New `executeWithRetry` util: retries rate-limit (429 / Cloudflare
1015) and transient gateway/network errors (502/503/504, timeouts,
connection resets) with exponential backoff and jitter, capped at 5
attempts. Honors a `retry_after` hint when present in the response body.
Non-retryable errors still throw immediately.
- All backfill queries and mutations are wrapped with it.
- Update batch concurrency reduced from 20 to 10 to keep bursts under
the rate limit in the first place.
- Bumped app version to 1.1.1 with a changelog entry.
## Test
- Added unit tests for `executeWithRetry` (success passthrough,
retry-then-succeed, non-retryable passthrough, retry exhaustion,
`retry_after` handling).
- `yarn test:unit` (28 passed), `yarn typecheck`, `yarn lint` all green
in the app package.
---
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martmull
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