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npub1mn7jgtj4w2pd0g0zeuhxsa6jy6p0rewxz4kujt98my82ahfmp72sxjexk7andWill Pfleger c537cbc1b8 feat(desktop): add get_agent_usage_series NIP-AM archive backend

Adds the Rust backend half of the NIP-AM local agent usage feature
(Rev 3 frozen plan): a rebuildable agent_metric_index parsed from
archived kind-44200 rows, a pure per-field accounting ladder
(agent_usage.rs) computing token/cost deltas with adjacent-cumulative
preference and direct-value fallback, and the get_agent_usage_series
Tauri command wiring backfill, orphan repair, collection-enabled
detection, and A13's hasArchivedEvidence into one series response.

commit_archive now indexes kind-44200 rows in the same transaction as
the canonical event insert, and upsert_archived_event/gc_orphaned_events
return/enforce the new-row and cascade-delete invariants (A5/A6) that
persistedAgentMetrics and the index's rebuildability depend on.

get_agent_usage_series' SQLite core is split into a plain sync fn so
it can be driven directly against an in-memory Connection in tests
without a Tauri AppState.

Co-authored-by: Will Pfleger <pfleger.will@gmail.com>
Signed-off-by: Will Pfleger <pfleger.will@gmail.com>

2026-07-20 23:20:29 -07:00