Is it posible to have a column with a Boolean value based on wether the entry is more than a month old ( > 30 )? How can this be achieved using the Table Builder?
You could create field type of boolean, and give to it name "More than a month old ( > 30 )".
Of course! You'll want to use s column handler and define a custom column that uses a closure for the value of the column to calculate your value based on however you need!