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You diagram is really hard to read on a 160 by 160 display, but the only
circular reference I can see (where an entity contains its own Primary Key
as a Foreign Key too) is AppUser. You could create a true circular
reference there.
A cycle relationship is more complex, where some group of entities refer to
each other in such a way that it is possible to create a "loop" of
relationships that feed back into itself. There are several possible 1:N
relationships that could generate a cycle, but I can't see how they would
naturally assume a cycle.
The short answer is yes, a cycle is possible in more than one way, but I
don't see how it would occur naturally.
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