FULL COLUMNS FOR user_vouchers:
- 'id'
- 'user_id'
- 'voucher_id'
- 'assigned_at'
- 'redeemed_at'
- 'status'

FULL COLUMNS FOR marketplace_listings:
- 'price'
- 'seller_id'
- 'voucher_id'
- 'id'
- 'updated_at'
- 'created_at'
- 'status'