## Summary
### Why
1. Sending the code to the lambda (~1Mb usually) is heavy on network and
results to a constant traffic of ~30Mb/s on AWS which results into TB of
network data every month
2. eval(1MB of code) is not that fast, it's heavy on memory and CPU on
lambda side
### High level
Adds two execution modes for logic functions, gated behind the new
`IS_LOGIC_FUNCTION_PREBUILT_MODE_ENABLED` workspace feature flag (off
everywhere by default):
- **LIVE** (current behavior, preserved bit-for-bit): the compiled
bundle is read from object storage and shipped in every Lambda invoke
payload. Used for fast iteration in the workflow editor / Settings test
runs.
- **PREBUILT** (new): the bundle is installed onto the per-function
Lambda alongside the unified executor, and invocations carry only `{
params, env, handlerName }` — saving JSON payload egress and warm-start
`import()` cost on every call.
### Key design choices
- **Unified Lambda handler** (`constants/executor/index.mjs`) dispatches
at runtime: `event.code` present ? LIVE (write to `/tmp`, dynamic
import) : `import('./prebuilt-logic-function.mjs')`. Both code paths
always coexist on the deployment package, so the same Lambda can serve
either mode without redeploying.
- **Install runs inside the `validateBuildAndRun` migration pipeline**,
not at execute time. `Create/UpdateLogicFunctionActionHandlerService`
calls `driver.installPrebuiltBundle` when `executionMode` flips
LIVE?PREBUILT or `checksum` changes while PREBUILT, gated on
`isBuildUpToDate=true` and a fresh checksum.
- **Strict execute, no reconciliation**:
`LogicFunctionExecutorService.execute` resolves `effectiveExecutionMode`
(caller override > feature flag > entity column). For PREBUILT it asks
the driver `getInstalledBundleChecksum` (Lambda `twenty:bundle-checksum`
tag for AWS, sidecar file locally) and throws
`LOGIC_FUNCTION_PREBUILT_BUNDLE_NOT_INSTALLED` on mismatch.
- **Feature flag gates every side effect**: with the flag off the
executor forces LIVE, the action-handler install hooks bail before AWS,
and workflow activation does not flip the mode. Rollback is just turning
the flag off.
### Lifecycle
- New workflow CODE step ? `LIVE`, no install.
- Workflow activated ? build + activation flips `executionMode=PREBUILT`
? action-handler installs the bundle + sets the Lambda tag.
- Draft from active version ? duplicated logic function reset to `LIVE`.
- App install ? manifest converter sets `PREBUILT`, create-action
handler installs.
- Test runs (`executeOneFromSource`, workflow editor) pass
`executionMode=LIVE` explicitly.
### Observability
`[lambda-timing]` log lines now include `effectiveExecutionMode` and
`payloadBytes`; the action handler logs `install_duration_ms` for each
install.
## Test plan
- [x] `npx nx typecheck twenty-server` ? passes
- [x] `npx oxlint --type-aware` on all changed files ? 0 warnings, 0
errors
- [x] `npx nx test twenty-server` ? 588 suites / 5009 tests pass (no
regressions vs main)
- [x] New unit suite `flat-logic-function-validator.service.spec.ts` ?
9/9
- [x] Existing
`workflow-version-step-operations.workspace-service.spec.ts` ? 8/8
(verified the new token-based DI avoids a circular-import regression)
- [x] Snapshot for
`ALL_UNIVERSAL_FLAT_ENTITY_PROPERTIES_TO_COMPARE_AND_STRINGIFY` updated
to include `executionMode`
- [x] Integration suite `logic-function-execution.integration-spec.ts`
extended to assert `executionMode=LIVE` on newly-created functions and
continues to exercise the LIVE happy path
- [ ] Manual staging rollout: flip
`IS_LOGIC_FUNCTION_PREBUILT_MODE_ENABLED` per workspace, observe
`[lambda-timing]` `payloadBytes` drop + `install_duration_ms`, then ramp
in prod.
