public void addCategories(List<Category> categories) {
    SQLiteDatabase db = this.getWritableDatabase();
    db.delete(TABLE_CATEGORIES, null, null);
    for (Category category : categories) {

      ContentValues values = new ContentValues();
      values.put(KEY_ID, category.getId()); // Contact Name
      values.put(KEY_NAME, category.getName()); // Contact Phone Number
      values.put(KEY_CREATED_AT, category.getCreated_at());
      values.put(KEY_UPDATED_AT, category.getUpdated_at());

      // Inserting Row
      db.insert(TABLE_CATEGORIES, null, values);
    }

    db.close(); // Closing database connection
  }