Fix: crash on import due to foreign key issue

[Andrew-Dickinson]

Import was crashing because the trick I used to change the ID of an object doesn't work when other objects reference it, kinda makes sense. Instead I use a trick where we construct a new object with the same ID as the one we want to replace, and then just call .save() to force the update. Easy

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.76%. Comparing base (9de5ed6) to head (48b25d4). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #478 +/- ## ======================================= Coverage 92.76% 92.76% ======================================= Files 62 62 Lines 2308 2308 ======================================= Hits 2141 2141 Misses 167 167 ```

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