Refactor to vertical slice

apps/backend/src/lib/slug.ts

@@ -0,0 +1,31 @@
+import { v7 as uuidv7 } from 'uuid';
+
+export function slugify(value: string): string {
+  return value
+    .normalize('NFD')
+    .replace(/[\u0300-\u036f]/g, '')
+    .toLowerCase()
+    .trim()
+    .replace(/[^a-z0-9\s-]/g, '')
+    .replace(/\s+/g, '-')
+    .replace(/-+/g, '-');
+}
+
+export async function buildUniqueSlug(
+  source: string,
+  findExisting: (slug: string) => Promise<{ id: string } | null>
+): Promise<string> {
+  const base = slugify(source);
+  const fallback = base.length > 0 ? base : `resource-${uuidv7().slice(0, 8)}`;
+
+  let candidate = fallback;
+  let index = 1;
+
+  while (true) {
+    const existing = await findExisting(candidate);
+    if (!existing) return candidate;
+
+    index += 1;
+    candidate = `${fallback}-${index}`;
+  }
+}