chore : add SQLA 2 compatibility

[jacquesfize]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 92.50000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.79%. Comparing base (c96516e) to head (f66d9c7).

Files with missing lines	Patch %	Lines
backend/gn_module_export/admin.py	75.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #248       +/-   ##
============================================
+ Coverage     0.00%   69.79%   +69.79%     
============================================
  Files            1       12       +11     
  Lines           10      692      +682     
============================================
+ Hits             0      483      +483     
- Misses          10      209      +199     

Flag	Coverage Δ
pytest	69.79% <92.50%> (+69.79%)	⬆️

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