Storing group membership in a database

Would it be possible to include an example of this topic like the previous version of SignalR? Here is a link to the doc of the previous version. https://docs.microsoft.com/en-us/aspnet/signalr/overview/guide-to-the-api/working-with-groups#storing-group-membership-in-a-database

It's a bit confusing when I'm lead to this article and there is no mention of it here.

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#### Document Details

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* ID: c8d77892-d376-2f23-2634-f5d34d962a1e
* Version Independent ID: 92ed6330-b49f-1620-6beb-8556a78ac7da
* Content: [Manage users and groups in SignalR](https://docs.microsoft.com/en-us/aspnet/core/signalr/groups?view=aspnetcore-2.2)
* Content Source: [aspnetcore/signalr/groups.md](https://github.com/aspnet/AspNetCore.Docs/blob/master/aspnetcore/signalr/groups.md)
* Product: **aspnet-core**
* Technology: **aspnetcore-signalr**
* GitHub Login: @bradygaster
* Microsoft Alias: **bradyg**