feat: better error messages

server/api/links/index.post.ts

@@ -11,6 +11,12 @@ const bodySchema = z.object({
 
 export default defineEventHandler(async (event) => {
   const body = await readValidatedBody(event, bodySchema.parse);
+
+  const conflicts = await findConflictingFields(body);
+  if (conflicts.length > 0) {
+    throw createError({ statusCode: 409, message: `A link with this ${joinFields(conflicts)} already exists` });
+  }
+
   const [link] = await db.insert(tables.links).values(body).returning();
   return link;
 });