Add execute to TimelineModel and api in controller to set it

[jmthomas]

This is similar to how we recently added shard. Do we need a migration or since it is a new attribute none is needed?

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 9 lines in your changes missing coverage. Please review.

Project coverage is 79.58%. Comparing base (5af74dc) to head (204289a).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
...cmd-tlm-api/app/controllers/timeline_controller.rb	50.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1760      +/-   ##
==========================================
- Coverage   79.59%   79.58%   -0.02%     
==========================================
  Files         517      517              
  Lines       40713    40736      +23     
==========================================
+ Hits        32404    32418      +14     
- Misses       8309     8318       +9     

Flag	Coverage Δ
python	84.30% <ø> (ø)
ruby-api	48.64% <52.63%> (+<0.01%)	⬆️
ruby-backend	82.61% <100.00%> (+<0.01%)	⬆️

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
17.1% Duplication on New Code

See analysis details on SonarQube Cloud

[ryanmelt]

Migrations depend on how the new attribute is used. If it is used correctly if not present then a migration is not needed. I'm guessing in Calendar you are expecting it to be there though in the JSON.