[almighty] Data Model, please review

[Michael Kleinhenz]

Hi all,

the updated data model is now available here:

https://www.lucidchart.com/invitations/accept/9eb41de4-4882-4f69-995f-8dd57a2e4a07

Please review it. It should contain all current knowledge and some changes:

 - everything in red is changed from the devdocs version. Mostly
corrections like
   inverse or wrong cardinalities.

 - added directions for the relations. Please review them closely.

 - added 0..* notation for cardinalities that also tell if a relation
can be zero.

Open question from my side:

 - there is a relation between Login and Work Item (the green one). I think
   this relation should be between User and Work item.

Thanks,
Michael

-- 
Michael Kleinhenz
Principal Software Engineer

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