fix: narrow artist PATCH/DELETE 404 catch to Prisma P2025 (rethrow real errors)

web/src/app/api/artists/[id]/route.ts

@@ -1,4 +1,5 @@
 import { prisma } from "@/lib/db";
+import { Prisma } from "@prisma/client";
 
 export async function GET(_request: Request, { params }: { params: Promise<{ id: string }> }) {
   const { id } = await params;
@@ -41,8 +42,11 @@ export async function PATCH(request: Request, { params }: { params: Promise<{ id
   try {
     const updated = await prisma.watchedArtist.update({ where: { id }, data: { autoMonitorFuture } });
     return Response.json({ id: updated.id, autoMonitorFuture: updated.autoMonitorFuture });
-  } catch {
-    return Response.json({ error: "not found" }, { status: 404 });
+  } catch (e) {
+    if (e instanceof Prisma.PrismaClientKnownRequestError && e.code === "P2025") {
+      return Response.json({ error: "not found" }, { status: 404 });
+    }
+    throw e;
   }
 }
 
@@ -51,7 +55,10 @@ export async function DELETE(_request: Request, { params }: { params: Promise<{
   try {
     await prisma.watchedArtist.delete({ where: { id } });
     return new Response(null, { status: 204 });
-  } catch {
-    return Response.json({ error: "not found" }, { status: 404 });
+  } catch (e) {
+    if (e instanceof Prisma.PrismaClientKnownRequestError && e.code === "P2025") {
+      return Response.json({ error: "not found" }, { status: 404 });
+    }
+    throw e;
   }
 }