I don't have the time to write it right now, but...

initialize a date token with the start date

create a repeat loop testing that the date token is less than the end date

in the loop

    store the date token in a multi-value date token

    use date token calculator to add a day to the date token

    save the calculated date in the old date token

end loop

Use the values in the multi-value date token to create your database records via a for each value loop