[x] Enable exporting with standard dates (still hardcoded though): new members and past members (and also currently active members)
[x] Enable exporting with custom active membership range
Database changes
Already executed in heroku's DB.
ALTER TABLE `members`
ADD `created` datetime NOT NULL;
ALTER TABLE `members`
ADD `modified` datetime NOT NULL;
UPDATE `members` SET `created` = DATE_SUB(NOW(),INTERVAL 40 DAY) WHERE id <= 3;
UPDATE `members` SET `created` = DATE_SUB(NOW(),INTERVAL 10 DAY) WHERE id > 3;
Database changes
Already executed in heroku's DB.