Anthony Stirling 939afef14f perf(portal): collapse admin-roster N+1 + session indexes (#7008)
# Description of Changes

Collapses the portal admin-roster endpoint (`getAdminSettingsData`,
`/api/v1/proprietary/ui-data/admin-settings`) from a per-user N+1 into a
constant set of queries, and adds the missing
session/user/team-membership indexes.

**Verified on H2 and real Postgres 16, 2,000-user roster:** 10,601 → 7
SQL statements, 600 → 0 writes-during-a-GET, O(N) → O(1). Portal-access
resolution is proven equivalent to the per-user check (parity test), and
a scaling guard fails the build if the endpoint ever regresses.

Also in scope (same controller / session subsystem): `getLoginData`
counts instead of loading the whole user table; `getTeamDetailsData`
fetch-joins authorities; `SessionScheduled` uses one bulk expire + a
bounded purge.

Behaviour note: the roster "active" flag now reflects *any* live session
(a strict superset of the old "newest session only") — no user who was
active is ever shown inactive.

---

## Checklist

### General

- [x] I have performed a self-review of my own code
- [x] My changes generate no new warnings

### Testing

- [x] I have run backend `task check` (spotless + full backend test
suite) — all green
- [x] I have tested my changes locally (before/after benchmark on H2 +
Postgres)
2026-07-16 12:00:02 +00:00
2026-07-11 12:48:53 +01:00
2026-03-25 11:00:40 +00:00
2026-03-25 11:00:40 +00:00

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