Check for cyclic dependencies on update

[Nostradamos]

Currently it's possible to have a plant where it's generationParents include it's own plantId
If possible try to supress this. Maybe not possible, or not that easy.
Attributes where this kind of error is possible:

• generationParents
• plantClonedFrom

PlantId -> GenerationParents -\
  /|\                         |
   |------------------------

[Nostradamos]

Should be possible to fix with an extra query in front of the update process.

[Nostradamos]

Could possibly get solved by a CHECK constraint:
https://sqlite.org/lang_createtable.html