Rates Engine v0.5.0-rc.101

[v0.5.0-rc.101] — 2026-06-01

Tested against Stellar Protocol 23 (Whisk).

Pre-deploy operator note: indexer restart picks up the batched-INSERT trade path. No migrations.

Fixed

• Trade-insert throughput lifted ~40× via batch INSERT.
  Live-r1 incident 2026-06-01: per-INSERT roundtrip cost capped
  sustained trade throughput at ~5 trades/sec on the live indexer,
  despite PostgreSQL handling 9000+ single-row INSERTs/sec in a raw
  loop (verified). The bottleneck was the serial drain loop in
  pipeline.PersistEvents: one event dequeue → one HandleEvent →
  one InsertTrade roundtrip, no overlap. With ~300 events per
  mainnet ledger, the cap meant ~1.8 ledgers/min processed vs the
  ~10 ledgers/min network rate, accumulating multi-hour lag.

  New Store.BatchInsertTrades writes N rows in one statement
  (INSERT … VALUES (…), (…), … ON CONFLICT DO NOTHING); same
  idempotency, same per-source source_entry_counts UPSERT semantic,
  same TradeInsertOutcomeTotal metrics. PersistEvents now
  buffers trade events up to 200 rows OR 200 ms (whichever first),
  flushes via the batch path, falls back per-row on a batch DB
  error. Non-trade events (oracle updates, supply observations,
  log-only events) stay on the single-row HandleEvent path.