anti a10aee282f perf(ingester): batch log writes into bulk commits ...

The ingester now accumulates up to DECNET_BATCH_SIZE rows (default 100)
or DECNET_BATCH_MAX_WAIT_MS (default 250ms) before flushing through
repo.add_logs — one transaction, one COMMIT per batch instead of per
row. Under attacker traffic this collapses N commits into ⌈N/100⌉ and
takes most of the SQLite writer-lock contention off the hot path.

Flush semantics are cancel-safe: _position only advances after a batch
commits successfully, and the flush helper bails without touching the
DB if the enclosing task is being cancelled (lifespan teardown).
Un-flushed lines stay in the file and are re-read on next startup.

Tests updated to assert on add_logs (bulk) instead of the per-row
add_log that the ingester no longer uses, plus a new test that 250
lines flush in ≤5 calls.

2026-04-17 16:37:34 -04:00

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