* change Offers interface to separate Update method into two.
* Implement Finish and Redeem method to avoid concurrent updates
* Implement FinishOffer and RedeemOffer service methods
* add tests
* fix linting issue
* add tests for checking Finish and Redeem's results to work as expected
* fix linting error
* init marketing service
Fix linting error
Create offerdb implementation
Create offers service
Add update method
Create offer table and migration
Fix linting error
fix conflicts
Insert new data
Change duration to have clear indication to be based on days
add error wrapper
Change from using uuid to int for id field
* Create Marketing service
* make error virable name more readable
* add condition in update service method to check offer status
* generate lock file
Change get to listAllOffers
* Add method for getting current offer
wip
* add check for expires_at in update method
* Fix conflicts
* add copyright header
* Fix linting error
* only allow update to active offers
* add isDefault argument to GetCurrent
* Update lock file
* add migration file
* finish migrate for adding credit_in_cents for both award and invitee
* save 100 years as expiration date for default offers
* create crud test for offers
* add GetCurrent test
* modify doc
* Fix GetCurrent to work with default offer
* fix linting issue
* add more tests and address feedbacks
* fix migration file
* add type column back to match with mockup design
* add type column back to match with mockup design
* move doc changes to new pr
* add comments
* change GetCurrent to GetCurrentByType
* fix typo
