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Variables

var (
	// ErrLockAlreadyHeld is returned if we attempt to double acquire
	ErrLockAlreadyHeld = fmt.Errorf("lock was already held")
	// ErrLockAcquireInterrupted is returned if we cancel the acquire
	ErrLockAcquireInterrupted = fmt.Errorf("lock's request was interrupted")
	// ErrLockNotAcquired if we cannot acquire
	ErrLockNotAcquired = fmt.Errorf("lock was not acquired")
)

var ErrNil = fmt.Errorf("nil returned")

ErrNil return from database data storing methods if no object in DB