The live tests seeded a tenant per run and never took it back

Each live store test makes its own client - deliberately, so they can
run in any order and so the isolation assertions have a real neighbour
to be isolated from - and none of them removed it afterwards. The dev
database had reached 242 abandoned tenants against the one real
company.

That is not untidy, it is a broken screen. The platform admin's
Companies view lists every client, so the real company sat under pages
of `walk1788761685056287000`, which is the first thing anyone opening
tenant administration would see.

dropTenant registers the cleanup against the CLIENT rather than each
table: every foreign key onto clients is ON DELETE CASCADE, so one
delete takes the sites, visitors, visits, face images, embeddings,
cameras and agents with it. A per-table list would rot the first time a
migration adds a table, and it would rot silently - the same shape as
the leak it replaces.

A failed cleanup calls t.Errorf rather than being ignored. A tenant
left behind is precisely what this exists to prevent, and swallowing
the error would let the leak come back with nothing to show for it.

Verified against the live database: three consecutive runs of the store
suite leave clients, sites and visits unchanged.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qiy5iKfz4L8S4vRaYPBdaU

server/internal/store/api_faces_live_test.go

@@ -26,6 +26,7 @@ func seedAgentSite(t *testing.T, st *Store, name string) ingest.Site {
 		name).Scan(&site.ClientID); err != nil {
 		t.Fatalf("seed client: %v", err)
 	}
+	dropTenant(t, st, site.ClientID)
 	if err := st.pool.QueryRow(ctx, `
 		INSERT INTO sites (client_id, name, slug) VALUES ($1::uuid, $2, $3)
 		RETURNING id::text`, site.ClientID, name, name).Scan(&site.SiteID); err != nil {