Rates Engine v0.5.0-rc.55

[v0.5.0-rc.55] — 2026-05-15

Changed

• backfill_coverage[].trade_count → entries, backed by an
  always-on per-source tally (source_entry_counts, migration
  0035). The old trade_count came from the IO-contended
  BackfillCoverageStats trades scan — during an all-time backfill
  it never completed, so every source's count collapsed to a
  misleading 0 (we actually had 60M+ trades). It was also
  structurally always-0 for oracle sources, which write to
  oracle_updates, never trades. The new entries column is a
  ~20-row tally table the writers bump atomically and
  idempotently: InsertTrade / InsertOracleUpdate increment it
  in the same statement as the row insert via a data-modifying
  CTE gated on HAVING count(*) > 0, so a backfill re-walk
  (ON CONFLICT DO NOTHING → 0 rows) never inflates the count.
  Reading it is O(20) regardless of trades/oracle_updates size, so
  it stays exact and available even mid-backfill, and it counts
  oracle updates for oracle sources. New ratesengine-ops seed-entry-counts authoritatively reconciles the tally from a
  full GROUP BY (run once post-backfill to fold in pre-counter
  history; SETs not ADDs, so re-running converges). Status-page
  column "Trades" → "Entries"; the section heading "Raw-trades
  coverage" → "Ingest coverage". Wire-shape change to
  /v1/diagnostics/ingestion (pre-v1; OpenAPI updated).