Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="app/api/artists/[id]/route.ts">

<violation number="1" location="app/api/artists/[id]/route.ts:10">
P1: Custom agent: **Module should export a single primary function whose name matches the filename**

This module exports multiple top-level functions (`OPTIONS` and `DELETE`) instead of a single primary export matching the filename `route`, violating the single-export module rule. Split the handlers into separate files or rename the primary export to match the filename.</violation>
</file>

<file name="lib/artists/deleteArtistHandler.ts">

<violation number="1" location="lib/artists/deleteArtistHandler.ts:7">
P2: Custom agent: **API Design Consistency and Maintainability**

Rule 1 requires POST for actions/mutations, but this new handler is explicitly for a DELETE mutation (`DELETE /api/artists/{id}`). Use POST for this mutation (or rename the endpoint/handler accordingly) to keep HTTP methods consistent with the API design rule.</violation>
</file>

<file name="lib/artists/__tests__/deleteArtist.test.ts">

<violation number="1" location="lib/artists/__tests__/deleteArtist.test.ts:1">
P2: Custom agent: **Enforce Clear Code Style and Maintainability Practices**

This new test file is 126 lines long, exceeding the 100-line limit in the Clear Code Style rule. Split the tests into smaller focused files (e.g., access validation vs delete behavior) to stay under the limit.</violation>
</file>

<file name="lib/artists/deleteArtist.ts">

<violation number="1" location="lib/artists/deleteArtist.ts:60">
P2: `getAccountArtistIds` returns `[]` on query errors, but this code treats an empty result as “no remaining links” and deletes the artist account. A transient DB error would incorrectly hard-delete an artist. Consider surfacing errors (throw/return null) and aborting the delete when the lookup fails.</violation>
</file>

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@lib/artists/deleteArtist.ts`:
- Around line 31-37: The current read-then-delete using getAccountArtistIds(...)
and deleteAccountById(artistId) is racy; make the orphan-check and deletion
atomic by moving the logic into a single transactional DB operation or RPC.
Replace the two-step flow with one DB call (e.g., add a new function like
deleteAccountIfNoArtistLinks(accountId) or a transaction wrapper used by
deleteArtist) that rechecks the related links and performs DELETE only when none
exist (for example: a transaction or single SQL DELETE ... WHERE id = $1 AND NOT
EXISTS (SELECT 1 FROM account_artists WHERE artist_id = $1)). Ensure the new
function is used instead of calling getAccountArtistIds and deleteAccountById
separately to avoid concurrency races.

In `@lib/artists/validateDeleteArtistRequest.ts`:
- Around line 51-63: The current validation uses
checkAccountArtistAccess(requesterAccountId, artistId) which permits org-level
access; change it to enforce a direct account↔artist link by calling a
direct-link check (e.g., checkAccountArtistDirectLink(requesterAccountId,
artistId)) or extend checkAccountArtistAccess with a flag to requireDirect=true,
and if that direct-link check returns false return the same 403 JSON error
response (status:"error", error:"Unauthorized delete attempt") with CORS
headers; update any imports or helper usage in validateDeleteArtistRequest to
reference the direct-link helper name used.

---

Nitpick comments:
In `@lib/supabase/account_artist_ids/deleteAccountArtistId.ts`:
- Line 1: Replace the relative import in deleteAccountArtistId.ts (currently
importing supabase from "../serverClient") with the canonical alias import
"@/lib/supabase/serverClient"; also ensure the file follows the documented
Supabase helper pattern by adding/verifying JSDoc on the exported function
(deleteAccountArtistId), consistent error handling around Supabase calls, and an
explicit return type for the function so it matches other lib/supabase/*.ts
utilities.

In `@lib/supabase/accounts/deleteAccountById.ts`:
- Line 1: The import in deleteAccountById.ts currently uses a relative path
(import supabase from "../serverClient"); update it to import the canonical
Supabase client from "@/lib/supabase/serverClient" and ensure the file follows
the project Supabase helper pattern: include JSDoc for the exported function
(e.g., deleteAccountById), proper error handling and typed return values
consistent with other lib/supabase/**/*.ts helpers, and use the imported
supabase instance from the new module name.