added backend-mgmt for dataset/dataset_entry and utterances, this includes upload and also displaying of the dataset on the admin pages

src/app/actions/datasets.ts

@@ -0,0 +1,46 @@
+'use server';
+
+import db from '@/lib/db';
+import { dataset } from '@/lib/model/dataset';
+import { eq } from 'drizzle-orm';
+import { revalidatePath } from 'next/cache';
+
+export async function createDataset({ name }: { name: string }) {
+  if (!name || !name.trim()) {
+    throw new Error('Dataset name is required');
+  }
+
+  try {
+    const result = await db.insert(dataset).values({ name: name.trim() });
+    revalidatePath('/admin');
+    return result;
+  } catch (error) {
+    console.error('Error creating dataset:', error);
+    throw new Error('Failed to create dataset');
+  }
+}
+
+export async function updateDataset(
+  id: number,
+  updates: { name?: string }
+) {
+  if (updates.name !== undefined && !updates.name.trim()) {
+    throw new Error('Dataset name cannot be empty');
+  }
+
+  try {
+    const result = await db
+      .update(dataset)
+      .set({
+        name: updates.name?.trim(),
+        updatedAt: new Date(),
+      })
+      .where(eq(dataset.id, id));
+    revalidatePath(`/admin/datasets/${id}`);
+    revalidatePath('/admin');
+    return result;
+  } catch (error) {
+    console.error('Error updating dataset:', error);
+    throw new Error('Failed to update dataset');
+  }
+}