Deleting a database does not remove activity from calculation setup

[marc-vdm]

Updating AB

• [X] Yes, I have updated AB and still experience this issue

What happened?

To repoduce:

1. create project
2. import biosphere
3. create database with activity
4. create calculation setup with activity
5. delete database
6. Leave project and come back
7. Could not load key '('testdb', '0913368f900c49b58a3af1a6b838dff4')' in Calculation Setup 'testsetup'

related: #304 #849

suggested resolution

• [ ] When deleting activity, not only check if it has downstream consumers, also check if it is used in calculation setups in the project
  • Notify user that activity will be removed from calculation setup(s) if they delete
  • Remove flow from setup(s) before deleting activity
• [ ] When deleting database, check if database is in keys in calculation setups
  • Notify that n activities from database are used in m calculation setups and will be removed from setup(s) if they delete
  • Remove flow(s) from setup(s) before deleting database

Relevant errors

No response

Operating system

Windows 10

Conda environment

No response