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Budget models

https://redmine.teklia.com/issues/8453

A new Django app is introduced at arkindex.budget, with two new models:

  • Budget

    • id: UUID, primary key.
    • name: CharField, up to 100 characters. It cannot be null, and must use a minimum length validator to require a length above 0, to make sure we can't just have a budget named "".
    • total: DecimalField with 12 total digits and 3 decimal places defaulting to 0. It can be negative, so there is no particular validation.
    • __str__ should return the name.

  • BudgetEntry

    • id: UUID, primary key.
    • created: DateTimeField with auto_now_add=True.
    • budget: Foreign key to Budget. Deleting a budget cascades into deleting its entries.
    • description: CharField with up to 255 characters. It cannot be null, and must use a minimum length validator to require a length above 0, to make sure we can't have entries with no description.
    • value: DecimalField with 12 total digits and 3 decimal places, with no default value.
    • user: Nullable foreign key to users.User, representing the user who caused this change in the budget, when we know who it is.
    • process: Nullable foreign key to process.Process, representing the process involved in this change in the budget, when there is one.
    • __str__ should return the description.

A new Corpus.budget nullable foreign key allows assigning a corpus to a budget.

The CorpusSerializer should include a new read-only budget_id field to return the ID of the budget assigned to the corpus. This should affect ListCorpus and RetrieveCorpus.