feat(monitoring/site-mappings): globalize site_domain_mappings

Drop tenant scoping on site_domain_mappings now that the citation query
resolves mappings without tenant filtering. Add a unique index on
registrable_domain plus an updated_at column, and switch the dev-seed
upsert to use ON CONFLICT (registrable_domain). Adds a SiteDomainMapping
type to ops/domain for the upcoming console management UI.

server/migrations_monitoring/20260410103000_create_monitoring_tables.up.sql

@@ -152,16 +152,22 @@ CREATE INDEX idx_citation_facts_run
 
 CREATE TABLE site_domain_mappings (
     id                 BIGSERIAL PRIMARY KEY,
-    tenant_id          BIGINT,
     registrable_domain VARCHAR(255) NOT NULL,
     site_key           VARCHAR(255) NOT NULL,
     site_name          VARCHAR(255) NOT NULL,
     is_active          BOOLEAN NOT NULL DEFAULT true,
-    created_at         TIMESTAMPTZ NOT NULL DEFAULT NOW()
+    created_at         TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at         TIMESTAMPTZ NOT NULL DEFAULT NOW()
 );
 
-CREATE INDEX idx_site_domain_mappings_lookup
-    ON site_domain_mappings(tenant_id, registrable_domain, is_active);
+CREATE UNIQUE INDEX uk_site_domain_mappings_domain
+    ON site_domain_mappings(registrable_domain);
+
+CREATE INDEX idx_site_domain_mappings_active_domain
+    ON site_domain_mappings(registrable_domain) WHERE is_active = TRUE;
+
+CREATE INDEX idx_site_domain_mappings_created
+    ON site_domain_mappings(created_at DESC, id DESC);
 
 CREATE TABLE monitoring_article_url_aliases (
     id                             BIGSERIAL PRIMARY KEY,

server/migrations_monitoring/20260429110000_globalize_site_domain_mappings.down.sql

@@ -0,0 +1,10 @@
+DROP INDEX IF EXISTS idx_site_domain_mappings_created;
+DROP INDEX IF EXISTS idx_site_domain_mappings_active_domain;
+DROP INDEX IF EXISTS uk_site_domain_mappings_domain;
+
+ALTER TABLE site_domain_mappings
+    ADD COLUMN IF NOT EXISTS tenant_id BIGINT,
+    DROP COLUMN IF EXISTS updated_at;
+
+CREATE INDEX IF NOT EXISTS idx_site_domain_mappings_lookup
+    ON site_domain_mappings(tenant_id, registrable_domain, is_active);

server/migrations_monitoring/20260429110000_globalize_site_domain_mappings.up.sql

@@ -0,0 +1,24 @@
+UPDATE site_domain_mappings
+SET registrable_domain = LOWER(TRIM(registrable_domain)),
+    site_key = LOWER(TRIM(site_key)),
+    site_name = TRIM(site_name);
+
+DELETE FROM site_domain_mappings older
+USING site_domain_mappings newer
+WHERE older.registrable_domain = newer.registrable_domain
+  AND older.id < newer.id;
+
+DROP INDEX IF EXISTS idx_site_domain_mappings_lookup;
+
+ALTER TABLE site_domain_mappings
+    DROP COLUMN IF EXISTS tenant_id,
+    ADD COLUMN IF NOT EXISTS updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW();
+
+CREATE UNIQUE INDEX IF NOT EXISTS uk_site_domain_mappings_domain
+    ON site_domain_mappings(registrable_domain);
+
+CREATE INDEX IF NOT EXISTS idx_site_domain_mappings_active_domain
+    ON site_domain_mappings(registrable_domain) WHERE is_active = TRUE;
+
+CREATE INDEX IF NOT EXISTS idx_site_domain_mappings_created
+    ON site_domain_mappings(created_at DESC, id DESC);