Method ClearUserNodeDailyUsage

internal/users/store.go:138–138

(userID string)

	AddUserNodeTraffic(userID, nodeID, date string, upload, download int64) error
	ListUserNodeUsage(userID string) ([]UserNodeUsage, error)
	ClearUserNodeDailyUsage(userID string) error

	// ListUserDailyUsage 返回用户近 days 天的每日流量（跨节点合并）。
	ListUserDailyUsage(userID string, days int) ([]UserDailyUsage, error)