Three Phase 0 seams, each with the current database behaviour as its only
backend:
- StreamSource: the stream row, this node's streams_servers row and the
stream options a node reads before running a stream. The launcher
(live, VOD and LLOD starts), MonitorCommand, ProxyCommand, ScannerCommand
and live.php's fanout proxy hand-off ran these queries themselves.
- StreamRowMerge: MAIN's side of a node's runtime state. StreamStateWriter's
SQL backend now calls it; later it merges `stream.state` events keyed by
the reporting node. eventFields() keeps only runtime columns and redacts
the source URL.
- StreamCacheBuilder: the stream_<id> cache entry (columns, server rows,
the direct-source rule), extracted from cron:cache_engine so the R2
stream delta can build the same shape.
OndemandCommand's stop path also still wrote streams_servers and signals
with raw SQL. It now uses StreamStateWriter and SignalDispatcher, like the
rest.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Es8UhyPS8MNjuYTagqfGWi
