db layer

go.work.sum

src/myaktion/db/db.go

src/myaktion/go.mod

src/myaktion/go.sum

src/myaktion/handler/campaign.go

src/myaktion/handler/util.go

src/myaktion/model/campaign.go

src/myaktion/model/donation.go

src/myaktion/service/campaign.go