For Quality

What to test

There is currently no automated test coverage for createOrUpdateOnlineConversation or findConversationByAddress (packages/whatsapp-official/src/services/online-conversation.service.ts) — no online-conversation.service.spec.ts exists, and messages.service.spec.ts doesn't exercise this path either. Anything you verify here today is manual/exploratory until tests are added.

Core scenarios

1. Baseline (no race): a brand-new contact sends one message. Confirm a

conversation is created, the message is attached, and the bot replies. (Unchanged by this PR — regression check.)

1. The race, by phone: simulate two webhook deliveries for the same new

phone number arriving concurrently (e.g., fire two requests to the messages webhook endpoint back-to-back with no await between them, for a phone number that has no existing conversation). Expect: one conversation row created, both messages attached to it, no error surfaced, no message silently dropped.

1. The race, by bsuid: same as above but for a contact with no wa_id

(only a business-scoped ID / masked number — see glossary). Same expected outcome.

1. where.id collision: a conversation already exists (matched by id via

a prior lookup or a phone merge), and the concurrent update's phone or bsuid value collides with a different existing conversation's address. Expect: the update still succeeds and the message still lands, but the colliding address field is not overwritten on either row (check both rows keep their original phone/bsuid afterward).

1. Genuinely unrecoverable error: force a P2002 where

findConversationByAddress can't resolve anything (e.g., neither phone nor bsuid present in create). Expect the original error to propagate, not be swallowed.

1. Non-P2002 errors: any other Prisma/DB error during the initial upsert

should still propagate unchanged — this PR should not widen the set of errors that get caught.

Edges worth probing specifically

• Ordering of the two racing requests: does it matter which one "wins" the

insert? It shouldn't — verify both orderings land the same way.

• More than two concurrent deliveries for the same brand-new contact (3+).

The fix's fallback re-queries by address rather than assuming a fixed winner, so this should generalize, but it's untested — worth a dedicated case given the low cost of adding one.

• The known non-fix: confirm (and don't file as a regression) that when a

patient is legitimately known under two different addresses that already belong to two different conversation rows, this PR leaves both rows as they are rather than merging them (online-conversation.service.ts:131-132).

• Message ordering after recovery: when the fallback path runs, confirm

messagesCount/unseenCount still increment correctly and lastMessage/lastActivity still update, since the retried update reuses the original update object minus phone/bsuid.

Suggested automated test to request

A unit test around createOrUpdateOnlineConversation with a mocked Prisma client that throws a P2002 on the first upsert call and asserts the fallback path calls findConversationByAddress (or uses where.id directly) and then issues a plain update with phone/bsuid stripped — covering scenarios 2–6 above without needing real concurrency.