Add constraints and fix nan issue

[codecov-commenter]

Codecov Report

Merging #134 (e04493b) into main (787e384) will decrease coverage by 0.18%. The diff coverage is 87.61%.

@@            Coverage Diff             @@
##             main     #134      +/-   ##
==========================================
- Coverage   94.38%   94.19%   -0.19%     
==========================================
  Files         111      111              
  Lines        3844     3896      +52     
==========================================
+ Hits         3628     3670      +42     
- Misses        216      226      +10     

Impacted Files	Coverage Δ
...lowgen/domain_models/factories/schedule_factory.py	79.31% <ø> (ø)
...generator/abstract_truck_for_containers_manager.py	98.11% <50.00%> (-1.89%)	:arrow_down:
conflowgen/api/port_call_manager.py	94.44% <75.00%> (-5.56%)	:arrow_down:
...duled_vehicle_for_onward_transportation_manager.py	88.81% <84.21%> (-3.12%)	:arrow_down:
conflowgen/domain_models/large_vehicle_schedule.py	93.10% <85.71%> (+1.10%)	:arrow_up:
conflowgen/tools/continuous_distribution.py	97.26% <92.30%> (-1.21%)	:arrow_down:
...owgen/domain_models/factories/container_factory.py	100.00% <100.00%> (ø)
...repositories/large_scheduled_vehicle_repository.py	100.00% <100.00%> (ø)
.../domain_models/repositories/schedule_repository.py	100.00% <100.00%> (ø)
conflowgen/domain_models/vehicle.py	91.66% <100.00%> (+0.14%)	:arrow_up:
... and 2 more

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