* add RedeemRewards method
* remove redeem from reward.db
* add redeemable cap check in redeem
* rename offerCap to redeemableCap
* remove redeem test
* update error message
* fix build
* Trigger Jenkins
* use correct credit setting for redeem
* fix comment
* change create qury to get redeemable_cap from offers table
* change referredBy to a pointer in user credit struct
* add default offer for offers table
* fix migration test
* Trigger Jenkins
* set the default value to be correct type
* skip soon will deleted test
* fix test data
* add orderby for ListAll
* change durations, redeemable cap to be a nullable field
* remove unecessary code
* move offer out of marketing package and remove marketing package
* fix imports
* fix rename errors
* remove offer service
* change package name from offers to rewards
* fix linting
* remove unused code and use appropriate comment