fix saving and display of stocks

lib/tables/prescriptions.dart

@@ -0,0 +1,27 @@
+import 'package:supabase_flutter/supabase_flutter.dart';
+import 'package:uuid/uuid.dart';
+
+class Prescriptions {
+  final SupabaseClient _supabase = Supabase.instance.client;
+
+  Future<List> getPrescriptions(String uuid) async {
+    try {
+      final data = await _supabase.from('prescriptions').select('prescriptions_uuid').eq('user_id', uuid);
+      return data.toList();
+    } catch (e) {
+      return [];
+    }
+  }
+
+  Future<bool> postPrescription(String userId, String medicineUuid) async {
+    try {
+      final prescriptionUUID = Uuid().v4();
+      await _supabase
+          .from('prescriptions')
+          .insert({'prescriptions_uuid': prescriptionUUID, 'user_id': userId, 'ref_medicine_uuid': medicineUuid});
+      return true;
+    } catch (e) {
+      return false;
+    }
+  }
+}