维护与更新租户的信息 maintain and update tenants database
此时，用于多租户服务器的几个额外的表(包括租户信息表)就创建好了。
At this time several additional tables, including one for tenant information, that are used by the Multi-Tenant Server are created.
这种用户与租户的关系是非常重要的信息，用于限制用户可以访问的数据。
That user-to-tenant relationship is the key information that is used to restrict the data that can be accessed by the user.
用户经过身份验证，并且知道了他们所属的TenantID，现在已经具有足够多的信息来过滤数据，从而使用户只能够访问其所属的租户的数据。
By having an authenticated user and knowing the TenantID to which they belong, there is sufficient information to be able to filter the data so that only data belonging to that tenant can be accessed.
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