Profile breaks for large number of Signups

[aaronschachter]

When there's too many Signups, we get an unterminated string: https://northstar.dosomething.org/v1/signups?user=56eab76e469c6444628b60f2&count=200

Trello: https://trello.com/c/Du5z8M7G

This feels like an API bug - wouldn't expect to get a 200 back with invalid JSON data in this scenario:

[lkpttn]

Also worth asking if there's a similar limit for completed actions.

[aaronschachter]

@lkpttn We're using currently using this single request to render both doing and completed on the Profile, by traversing through each Signup.

[aaronschachter]

This would be best handled by lazy loading all Signups ( #967 ) but temp blocked by phoenix#6301 ^