feat: audit vocabulary/term/authority creation, attributing the acting user (#21)

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

crates/api/tests/admin_catalog.rs

@@ -1,8 +1,8 @@
 use api::{AppState, build_app, migrate_sessions};
 use axum::body::Body;
 use axum::http::{Request, StatusCode, header};
-use db::users;
-use domain::{AuditActor, Email, NewUser, Role};
+use db::{audit, users};
+use domain::{AuditAction, AuditActor, Email, NewUser, Role};
 use http_body_util::BodyExt;
 use sqlx::PgPool;
 use tower::ServiceExt;
@@ -290,3 +290,44 @@ async fn add_term_to_missing_vocabulary_is_404(pool: PgPool) {
 
     assert_eq!(resp.status(), StatusCode::NOT_FOUND);
 }
+
+#[sqlx::test(migrations = "../db/migrations")]
+async fn creating_a_vocabulary_writes_an_audit_entry(pool: PgPool) {
+    migrate_sessions(&db::Db::from_pool(pool.clone()))
+        .await
+        .unwrap();
+
+    seed_user(&pool, "ed@example.com", "pw-editor-123", Role::Editor).await;
+
+    let app = build_app(state(pool.clone()));
+    let cookie = login(&app, "ed@example.com", "pw-editor-123").await;
+
+    let resp = app
+        .oneshot(
+            Request::builder()
+                .method("POST")
+                .uri("/api/admin/vocabularies")
+                .header(header::COOKIE, &cookie)
+                .header(header::CONTENT_TYPE, "application/json")
+                .body(Body::from(r#"{"key":"audit-test"}"#))
+                .unwrap(),
+        )
+        .await
+        .unwrap();
+    assert_eq!(resp.status(), StatusCode::CREATED);
+
+    let body: serde_json::Value =
+        serde_json::from_slice(&resp.into_body().collect().await.unwrap().to_bytes()).unwrap();
+    let vocab_id: uuid::Uuid = body["id"].as_str().unwrap().parse().unwrap();
+
+    let history = audit::history_for(&pool, "vocabulary", vocab_id)
+        .await
+        .unwrap();
+
+    assert_eq!(history.len(), 1);
+    assert_eq!(history[0].action, AuditAction::Created);
+    assert!(
+        matches!(history[0].actor, AuditActor::User(_)),
+        "expected actor to be a user"
+    );
+}