user_roles

Column Name	Type	Comment	Default	Null	Remark
id	bigint UNSIGNED	Primary Key ID		NO	Auto Increment
user_id	bigint UNSIGNED	User Primary Key ID		NO	Related field users->id
role_id	int UNSIGNED	Role ID		NO	Related field roles->id
is_main	tinyint UNSIGNED	Is Main Role	0	NO	0.Ordinary / 1.Main Role
expired_at	timestamp	Role Validity Period		YES	Expiration Time
restore_role_id	int UNSIGNED	Inherit Role ID		YES	If the main role, who will inherit the main role after expiration
created_at	timestamp	Create Time	useCurrent	NO	For example, MySQL defaults to CURRENT_TIMESTAMP
updated_at	timestamp	Update Time		YES
deleted_at	timestamp	Delete Time		YES