test+refactor: audit-row assertions + uniform PATCH rollback (review follow-ups)

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

crates/db/tests/vocab.rs

@@ -1,6 +1,7 @@
-use db::{Db, catalog, fields, vocab};
+use db::{Db, audit, catalog, fields, vocab};
 use domain::{
-    AuditActor, FieldType, LocalizedLabel, NewFieldDefinition, NewTerm, ObjectInput, Visibility,
+    AuditAction, AuditActor, FieldType, LocalizedLabel, NewFieldDefinition, NewTerm, ObjectInput,
+    Visibility,
 };
 use sqlx::PgPool;
 
@@ -222,6 +223,15 @@ async fn update_term_changes_labels_and_uri(pool: PgPool) {
     .await
     .unwrap();
     assert!(existed);
+
+    let history = audit::history_for(&mut *tx, "term", term_id.to_uuid())
+        .await
+        .unwrap();
+    assert!(
+        history.iter().any(|e| e.action == AuditAction::Updated),
+        "expected an Updated audit entry for the term"
+    );
+
     tx.commit().await.unwrap();
 
     let term = vocab::term_by_id(db.pool(), term_id)
@@ -308,6 +318,14 @@ async fn delete_term_blocks_when_referenced_then_succeeds(pool: PgPool) {
             .is_none()
     );
 
+    let history = audit::history_for(&mut *tx, "term", term_id.to_uuid())
+        .await
+        .unwrap();
+    assert!(
+        history.iter().any(|e| e.action == AuditAction::Deleted),
+        "expected a Deleted audit entry for the term"
+    );
+
     let gone = vocab::delete_term(&mut tx, AuditActor::System, vocab.id, term_id)
         .await
         .unwrap();