Redis Streams pub/sub (XADD/XREAD BLOCK) with Last-Event-ID replay, bounded
backpressure queue, 25s heartbeat, and full retry/abort handling. Publishes
RealtimeEvents from Baserow webhook handler after cache invalidation. 380 tests.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
