Add execution durations to flow

[Knerio]

close #779

[Knerio]

Maybe we should save the last x execution times for comparison? @raphael-goetz @Taucher2003 what do you think?

[github-actions]

GitLab Pipeline Action

General information

Link to pipeline: https://gitlab.com/code0-tech/development/sagittarius/-/pipelines/2222278893

Status: Failed
Duration: 3 minutes

Job summaries

rspec: [ee]

Coverage report available at https://code0-tech.gitlab.io/-/development/sagittarius/-/jobs/12484566277/artifacts/tmp/coverage/index.html
Test summary available at https://gitlab.com/code0-tech/development/sagittarius/-/pipelines/2222278893/test_report
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rspec: [ce]

Coverage report available at https://code0-tech.gitlab.io/-/development/sagittarius/-/jobs/12484566272/artifacts/tmp/coverage/index.html
Test summary available at https://gitlab.com/code0-tech/development/sagittarius/-/pipelines/2222278893/test_report
Finished in 0.00009 seconds (files took 4.62 seconds to load)
0 examples, 0 failures, 222 errors occurred outside of examples
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rubocop

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[Taucher2003]

A single field is not going to work for our requirements. We need to store each execution duration (well, more like a daily aggregate of all executions that day) and can't store only the last execution duration. This is going to be used for usage quotas, so we need to know how much time was used for a given time span.

We definitely also need to store the time in relation to the runtime because not every runtime is subject to usage quotas. Not sure if we need granularity for each flow or if we should limit the granularity to projects.

[Knerio]

So we should store every execution time of every flow? Or just in the last 14 days or so?