Checking constraints for table 'user_vouchers':
Array
(
    [0] => Array
        (
            [conname] => user_vouchers_pkey
            [pg_get_constraintdef] => PRIMARY KEY (id)
        )

    [1] => Array
        (
            [conname] => user_vouchers_user_id_voucher_id_key
            [pg_get_constraintdef] => UNIQUE (user_id, voucher_id)
        )

    [2] => Array
        (
            [conname] => user_vouchers_user_id_fkey
            [pg_get_constraintdef] => FOREIGN KEY (user_id) REFERENCES users(id)
        )

    [3] => Array
        (
            [conname] => user_vouchers_voucher_id_fkey
            [pg_get_constraintdef] => FOREIGN KEY (voucher_id) REFERENCES vouchers(id)
        )

)

Checking columns for table 'user_vouchers':
Array
(
    [0] => Array
        (
            [column_name] => id
            [data_type] => integer
            [is_nullable] => NO
        )

    [1] => Array
        (
            [column_name] => user_id
            [data_type] => integer
            [is_nullable] => YES
        )

    [2] => Array
        (
            [column_name] => voucher_id
            [data_type] => integer
            [is_nullable] => YES
        )

    [3] => Array
        (
            [column_name] => assigned_at
            [data_type] => timestamp with time zone
            [is_nullable] => YES
        )

    [4] => Array
        (
            [column_name] => redeemed_at
            [data_type] => timestamp with time zone
            [is_nullable] => YES
        )

    [5] => Array
        (
            [column_name] => status
            [data_type] => text
            [is_nullable] => YES
        )

)