Please address the comments from this code review:

## Overall Comments
- In `patch_assignments`, the insert_many call uses both `.on_conflict(...).do_nothing()` and a trailing `.do_nothing()`, which is redundant and can be simplified to rely on the configured `OnConflict` clause only.
- The OpenAPI/utoipa annotation for `patch_assignments` only declares 204/400/401/403 but the service can return `Error::NotFound`, so consider adding a 404 response to the path metadata to align the API description with actual behavior.

## Individual Comments

### Comment 1
<location path="modules/fundamental/src/sbom_group/endpoints/mod.rs" line_range="52" />
<code_context>
+        .service(patch_assignments);
 }

 #[utoipa::path(
</code_context>
<issue_to_address>
**issue (bug_risk):** The OpenAPI responses omit 404, even though the service can return `NotFound`.

`patch_assignments` can return `Error::NotFound` (e.g., when SBOM IDs fail to parse or SBOMs are missing), but the `utoipa::path` annotation only declares 204/400/401/403. This divergence between behavior and OpenAPI spec can mislead generated clients and integrators. Please either document a 404 response in the path or adjust the error handling to use one of the declared status codes.
</issue_to_address>

### Comment 2
<location path="modules/fundamental/src/sbom_group/endpoints/test/assignment.rs" line_range="446-455" />
<code_context>
+
+#[test_context(TrustifyContext)]
+#[test_log::test(actix_web::test)]
+async fn patch_sbom_group_assignments_add(ctx: &TrustifyContext) -> anyhow::Result<()> {
+    let app = caller(ctx).await?;
+
+    let group1: GroupResponse = Create::new("Group 1").execute(&app).await?;
+    let group2: GroupResponse = Create::new("Group 2").execute(&app).await?;
+
+    let sbom = ctx
+        .ingest_document("zookeeper-3.9.2-cyclonedx.json")
+        .await?;
+    let sbom_id = sbom.id.to_string();
+
+    PatchAssignments::new(vec![sbom_id.clone()])
+        .add_groups(vec![group1.id.clone(), group2.id.clone()])
+        .execute(&app)
+        .await?;
+
+    assert_assigned_groups(&app, &sbom_id, &[&group1.id, &group2.id]).await?;
+
+    Ok(())
</code_context>
<issue_to_address>
**suggestion (testing):** Add coverage for PATCH semantics when multiple SBOM IDs are passed (cartesian product behavior)

Current tests only cover a single SBOM, but the PATCH endpoint is documented to apply cartesian product semantics across all `sbom_ids` and `add`/`remove` groups. Please add at least one integration test using `PatchAssignments::new(vec![sbom1_id.clone(), sbom2_id.clone()])` with multiple groups in `add` and/or `remove`, and assert that each SBOM receives the expected assignments. This will verify the bulk semantics and help prevent regressions in multi-SBOM behavior.

Suggested implementation:

```rust
 // --- PATCH assignment tests ---
//
// Bulk PATCH assignment semantics: multiple SBOMs with multiple groups (cartesian product)
#[test_context(TrustifyContext)]
#[test_log::test(actix_web::test)]
async fn patch_sbom_group_assignments_bulk_add(ctx: &TrustifyContext) -> anyhow::Result<()> {
    let app = caller(ctx).await?;

    // create groups to be added
    let group1: GroupResponse = Create::new("Bulk Group 1").execute(&app).await?;
    let group2: GroupResponse = Create::new("Bulk Group 2").execute(&app).await?;

    // ingest two SBOMs
    let sbom1 = ctx.ingest_document("zookeeper-3.9.2-cyclonedx.json").await?;
    let sbom2 = ctx.ingest_document("zookeeper-3.9.2-cyclonedx.json").await?;

    let sbom1_id = sbom1.id.to_string();
    let sbom2_id = sbom2.id.to_string();

    // apply PATCH with multiple sbom_ids and multiple groups; should be cartesian product
    PatchAssignments::new(vec![sbom1_id.clone(), sbom2_id.clone()])
        .add_groups(vec![group1.id.clone(), group2.id.clone()])
        .execute(&app)
        .await?;

    // verify each SBOM has both groups assigned
    assert_assigned_groups(&app, &sbom1_id, &[&group1.id, &group2.id]).await?;
    assert_assigned_groups(&app, &sbom2_id, &[&group1.id, &group2.id]).await?;

    Ok(())
}

// --- PATCH assignment tests ---

```

- This edit assumes `GroupResponse`, `Create`, `PatchAssignments`, and `assert_assigned_groups` are already imported in `assignment.rs`. If any are missing, add the appropriate `use` statements at the top of the file, consistent with existing conventions.
- If the test module uses specific naming or grouping/ordering conventions for tests (e.g., all `patch_*` tests grouped together), you may want to move `patch_sbom_group_assignments_bulk_add` next to the other PATCH assignment tests to keep the file organized.
- If there is an existing helper for creating multiple SBOMs or groups in tests, you can refactor the test to reuse that helper instead of calling `ingest_document` and `Create::new` directly, while keeping the core cartesian-product assertions unchanged.
</issue_to_address>