Previously each match goal sync did: DELETE (auto-commit) → N
individual INSERTs (each auto-commit). During those ~50ms readers
saw 0 goals for the match — the inconsistency window.
Now: collectGoals() builds the rows in memory, replaceGoals() wraps
the DELETE + single bulk VALUES INSERT in a transaction. Under
Postgres READ COMMITTED, readers see the old goals until commit and
the full new set after — never an empty window.
Also drop sync pool from max:5 → max:2; the job is fully sequential
and was holding idle connections unnecessarily.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
valknar
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