The Context Dashboard's heatmap and session cards read the session list's
projection column, which only serves durable cache rows. The new
contextActivity unit folds each assistant settlement into a per-day ledger
(billed tokens + completed requests, keyed by local day, 400-day retention)
alongside the existing contextTimeline/contextHeaders units.
A session folded before a unit existed — or one that predates the plugin
entirely — has no row until it next goes live, so a one-pass warm-up
(backfill.ts) cold-reads every such session's durable log through the
projection cache's own cold-read ladder (coldSnapshot): each unit seeds
from its cached rows, folds the remainder, and the refreshed checkpoint is
written back. Live sessions are skipped (a throwing liveness probe skips
conservatively too), unreadable logs are logged and skipped per session,
and the whole pass rides a deferred inject across the
sessionQuery/sessionProjectionCache/sessionPersistence/sessions services.
Bowen Liang
e33deda752