* feat(db): five pgx pools with fixed session settings and Prometheus tracing
* feat(guards): per-family observe/enforce guards with client slots, deadlines and a shadow budget
* fix(guards): attribute only guard deadlines and classify like the handlers
* feat(db): route API statements by sqlc name; class C always unnamed
* feat(admin): statement statistics by sqlc name; create pg_stat_statements where allowed
* fix(db): skip pg_stat_statements when no schema is creatable
* feat(background): index health against post-rebuild baselines, Postgres activity, job and ingest metrics
* feat: separate API, ingest and maintenance stores; guards on the public API; metrics listener
* fix(db): keep ingest writes waiting, size the ingest pool to the host, tidy
* test(db): give the statements probe a query id of its own
GET /traces takes an optional cursorTag so tags sharing a millisecond survive
paging. Migrations run under an advisory lock and record each file in the
same implicit transaction, so a crash can't strand a fresh database.
Overview windowHours counts the hours it covers, hourly observer activity
fills unrolled hours from raw rows, and integration fixtures are UTC.
Stats endpoints read hourly rollup tables filled once per closed hour by one
advisory-locked task, instead of materialized views that re-scanned every
observation on each refresh. IATA-set tables give exact distinct counts for any
IATA set or region. Cleanup holds raw rows for unrolled hours (up to 24h).
Adds /stats/series; ingest keeps packet observation counts, observer last IATA,
channel message counts and trace tag summaries. 001_baseline.sql is rewritten,
so pre-release 2.0 databases must be recreated. See docs/historical-stats.md.
MrAlders0n