Custom fields on cards as limits for dates or rows.

[Ken Ferris]

Could a custom field on a card be tied in to somehow limit the number of cards in a row or for a date? 

For example, let's say I have four cards and they all have the same date. I want to assign a unit value to each card, however I don't want the total unit values of all the cards for that date to exceed a limit. Can this be done?  

[Gaurav Kataria]

It is not possible to create such an automation natively, but you could use the API to fetch the data and to do that calculation outside of Trello