Sign-in by customer: realm petrolyst, row rules, guest role (PD-21)

Keycloak import for realm petrolyst: two clients, petrolyst with MFA for
Superset and Traefik, petrolyst-app password only. It lists only
app.petrolyst.com and traefik.petrolyst.com, and no customer names, as this
repository is public. public.v_operator shows each customer's group. Dashboards
overview and site, role Petrolyst Guest, filtered by row. Superset refuses a
user with no mapped role. The realm travels with the release: each release's
compose files name their realm and secret file, and a rollback needs only its
target's secret. Not deployed.

Checks earlier on this content: tests/run.sh 109 of 109 and read-only, dashboards
import twice, column drift 0, compose config on old and new trees, the secret
check on a scratch folder, a rehearsal on a throwaway Keycloak 26.4. Never a real
deploy or rollback; shellcheck not installed today, clean when last run. Codex
inspected once; its fixes are not re-inspected, on the owner's word.

Bands: persistence, Superset. Rules: 1, 2, 3, 6, 14.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

stacks/fuel-monitoring/fuel-db/migrations/0003_bi_views.sql

@@ -631,4 +631,9 @@ SELECT s.site_uid, s.site_code, s.site_name, s.site_label, s.operator_uid,
 FROM fm.imported_calculation c JOIN public.v_site s ON s.site_uid = c.holder_uid
 WHERE c.claim_status IN ('asserted','reviewed','disputed');
 
+-- Which Keycloak group is which customer (PD-21). Only server/ reads this, at sign-in; it holds no
+-- site data, and no dashboard has a dataset on it.
+CREATE VIEW public.v_operator AS
+SELECT operator_uid, name, keycloak_group FROM fm.operator;
+
 COMMIT;