Demo account feature

[mbollmann]

Originally reported by: Marcel Bollmann (Bitbucket: mbollmann, GitHub: mbollmann)

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Implement a demo account feature that does not require a log-in, and always gets a clean working environment.

A few considerations to keep in mind:

• Multiple people that are online at the same time must have different usernames, so a single "demo" user is not sufficient.
• Documents can only be edited by a single user at a time, so a shared demo project could have all its texts locked by other demo users.
• Users should not be able to "vandalize" their demo texts in a way that other users can see.

Therefore, a demo feature could be implemented by:

• Creating a new, temporary user name for each demo user.
• Having a clean demo project which is cloned for each demo user.

What effects would such an implementation have on server & database load, though? Is there an easier way to do this?

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• Bitbucket: https://bitbucket.org/mbollmann/cora/issue/6