## What
The `last-contact` app only refreshed the last contact on Companies and
Opportunities when a new email or meeting arrived. When relationships
changed but no interaction happened, those fields went stale:
- Creating an opportunity with an existing point of contact left its
last contact empty.
- Changing an opportunity's point of contact kept the previous contact's
value.
- Assigning a person (who already had contact history) to a company
never surfaced on the company.
This adds logic functions that recompute the derived last-contact fields
when the record or its relationships change.
## Changes
New logic functions (auto-discovered):
- `on-opportunity-created` (`opportunity.created`) and
`on-opportunity-updated` (`opportunity.updated`, `pointOfContactId`)
recompute an opportunity's last contact from its point of contact.
- `on-company-created` (`company.created`) recomputes a company's last
contact from its people.
- `on-person-created` (`person.created`) and `on-person-updated`
(`person.updated`, `companyId`) recompute the former and current
company's last contact when a person joins or leaves.
Shared helpers `recomputeOpportunityLastContact` and
`recomputeCompanyLastContact` mirror the point-of-contact /
most-recent-person value onto the record (clearing it when there is no
contact). Reads use the morph relation subfield (`lastContactItemMessage
{ id }`), matching the existing integration-test read pattern.
The `updatedFields` filters keep these off the interaction write path,
so they never self-trigger.
## Tests
- Unit tests for both recompute helpers and the new logic functions.
- Integration tests covering opportunity-on-create, point-of-contact
change, person joining/leaving a company, and the empty-company case.
- `typecheck`, `lint`, and unit tests pass.
---
_Generated by [Claude
Code](https://claude.ai/code/session_014LMuzNLGYrL5eTkMB3UDRV)_
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martmull
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