feat(db): add vocabulary, term, and authority tables

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

crates/db/migrations/0002_vocabularies_authorities.sql

@@ -0,0 +1,34 @@
+-- Controlled vocabularies (term sources) and their terms.
+CREATE TABLE vocabulary (
+    id  UUID PRIMARY KEY,
+    key TEXT NOT NULL UNIQUE          -- e.g. 'material', 'object_name'
+);
+
+CREATE TABLE term (
+    id            UUID PRIMARY KEY,
+    vocabulary_id UUID NOT NULL REFERENCES vocabulary (id) ON DELETE CASCADE,
+    external_uri  TEXT                 -- e.g. Getty AAT / KulturNav / Wikidata URI
+);
+CREATE INDEX term_vocabulary_idx ON term (vocabulary_id);
+
+CREATE TABLE term_label (
+    term_id UUID NOT NULL REFERENCES term (id) ON DELETE CASCADE,
+    lang    TEXT NOT NULL,            -- BCP-47, e.g. 'sv', 'en'
+    label   TEXT NOT NULL,
+    PRIMARY KEY (term_id, lang)
+);
+
+-- Authority records: person / organisation / place. Store once, link many.
+CREATE TABLE authority (
+    id           UUID PRIMARY KEY,
+    kind         TEXT NOT NULL CHECK (kind IN ('person', 'organisation', 'place')),
+    external_uri TEXT
+);
+CREATE INDEX authority_kind_idx ON authority (kind);
+
+CREATE TABLE authority_label (
+    authority_id UUID NOT NULL REFERENCES authority (id) ON DELETE CASCADE,
+    lang         TEXT NOT NULL,
+    label        TEXT NOT NULL,
+    PRIMARY KEY (authority_id, lang)
+);

crates/db/tests/migrate.rs

@@ -18,3 +18,26 @@ async fn migrate_is_idempotent_and_creates_audit_log(pool: PgPool) {
             .unwrap();
     assert_eq!(regclass.as_deref(), Some("audit_log"));
 }
+
+#[sqlx::test]
+async fn migrate_creates_vocabulary_and_authority_tables(pool: PgPool) {
+    let db = Db::from_pool(pool);
+    for table in [
+        "vocabulary",
+        "term",
+        "term_label",
+        "authority",
+        "authority_label",
+    ] {
+        let regclass: Option<String> =
+            sqlx::query_scalar(&format!("SELECT to_regclass('public.{table}')::text"))
+                .fetch_one(db.pool())
+                .await
+                .unwrap();
+        assert_eq!(
+            regclass.as_deref(),
+            Some(table),
+            "table {table} should exist"
+        );
+    }
+}