[py3] Model Constructors

[fangeugene]

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[codecov]

Codecov Report

Merging #4117 (7ed89a1) into py3 (d6bc12c) will decrease coverage by 23.99%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##              py3    #4117       +/-   ##
===========================================
- Coverage   95.21%   71.22%   -24.00%     
===========================================
  Files         493        8      -485     
  Lines       28198      344    -27854     
  Branches       60       60               
===========================================
- Hits        26849      245    -26604     
+ Misses       1341       91     -1250     
  Partials        8        8               

Impacted Files	Coverage Δ
...handlers/helpers/tests/add_alliance_status_test.py
src/backend/api/handlers/tests/event_test.py
src/backend/api/handlers/tests/team_test.py
...rc/backend/api/handlers/tests/update_teams_test.py
src/backend/api/handlers/trusted.py
...ache_clearing/tests/database_cache_clearer_test.py
src/backend/common/models/event_team.py
src/backend/common/models/tests/event_team_test.py
src/backend/common/models/tests/event_test.py
...es/tests/cached_query_result_compatibility_test.py
... and 475 more

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