feat: allow running with legacy model/graph data

[holtgrewe]

No description provided.

[codecov]

Codecov Report

Patch coverage: 65.51% and project coverage change: -1.49% ⚠️

Comparison is base (278086a) 84.91% compared to head (7b04211) 83.42%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
- Coverage   84.91%   83.42%   -1.49%     
==========================================
  Files           5        5              
  Lines         338      356      +18     
==========================================
+ Hits          287      297      +10     
- Misses         51       59       +8     

Files Changed	Coverage Δ
cada_prio/predict.py	81.25% <62.96%> (-6.56%)	⬇️
cada_prio/rest_server.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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