balance

type Record struct {
	Id uint64

	TokenAccount   string
	Quarks         uint64
	SlotCheckpoint uint64

	LastUpdatedAt time.Time
}

type Store interface {
	// SaveCheckpoint saves a balance at a checkpoint. ErrStaleCheckpoint is returned
	// if the checkpoint is outdated
	SaveCheckpoint(ctx context.Context, record *Record) error

	// GetCheckpoint gets a balance checkpoint for a given account. ErrCheckpointNotFound
	// is returend if no DB record exists.
	GetCheckpoint(ctx context.Context, account string) (*Record, error)
}