versioning

type IMaintainVersions interface {
	ApplyChanges(stmts []string) error
	AddVersion(version int, description string, appliedOn time.Time) error
	RemoveVersion(version int) error
}

type IManageVersions interface {
	GetPreviousVersion() (int, int, error)
	GetCurrentVersion() (int, error)
	ApplyChanges(stmts []string) error
	AddVersion(version int, description string, appliedOn time.Time) error
	RemoveVersion(version int) error
}

type IRecallVersions interface {
	GetPreviousVersion() (int, int, error)
	GetCurrentVersion() (int, error)
}

type VersionService struct {
	Session *gocql.Session
}