Marc-André Bombeck ad62fe229f fix(api): correct batch-ingest race reconciliation — accurate inserted/duplicate counts under contention ...

The previous race-reconciliation block compared post-insert rows in
the DB against the rows we attempted to insert, downgrading any
"inserted-but-not-stored" entries to "duplicate". Under standard
Postgres semantics that branch never fires: `skipDuplicates`
absorbs duplicate-key conflicts but the row is still present in the
table (written by the other batch that won the race). So every
attempted row was "stored" and the loop ran as a no-op, leaving
the per-entry envelope inconsistent with the aggregate counts when
two batches collide. The v1.5 iOS sync cursor depends on the
envelope sums matching the aggregate counts to checkpoint
correctly.

Pragmatic fix: trust `createMany.count` for the aggregate
`insertedCount` and downgrade exactly `toInsert.length -
insertedCount` per-entry "inserted" statuses to "duplicate". The
post-fix loop no longer touches `insertedCount` (it was already
correct from createMany) so the count cannot drift negative. Order
doesn't matter for the client — both statuses checkpoint past the
row and the DB ends up with the same single-copy state.

Concurrent-write integration test asserts the three invariants the
iOS sync cursor relies on: per-entry sums equal aggregate counts,
aggregate counts stay non-negative, and the DB row count matches
the combined `inserted` total.

2026-05-14 17:01:07 +02:00

..

integration

fix(api): correct batch-ingest race reconciliation — accurate inserted/duplicate counts under contention

2026-05-14 17:01:07 +02:00