[Sprint/GiddyGiraffe](feat): Add in delegate for checking for onchain badge

Closes #493 (closed)

This change, when an onchain boost is accepted, should set the users newfound onchain_booster variable to the (current Unix timestamp + 1 week).

This is to be digested by the front-end to determine whether or not to show the onchain booster badge on a users profile.

Ideally this would be tested on a seperate domain before public release.