Change the ImageQuality conditions to use a continuous range

[dngomez]

Changelog

feature (GSCHED-1042): Start using ImageQuality as a continuous range instead of bins and keep it retro-compatible

Should resolve the last lucupy PR modifications.

Scope

• Backend (backend/)
• Frontend (frontend/)
• Docs (docs/)
• CI/Infra (.github/)

Jira

GSCHED-1042

Checklist

• Changelog fragment added to changelog.d/
• Commit messages follow conventional commits (feat(backend):, fix(frontend):, etc.)
• No breaking changes (or breaking fragment added)

[stroncod]

How are we going to handle IQ in the UI as well. is going to show up old bins or gpp?

[stroncod]

One thing Claude flagged: percentile_iq might return IQ 0.0 and this would make the observation to get a 0 score, maybe we need to floor this to IQ20?

[dngomez]

Where is that happening, I can't find the place were the score is being computed and uses the IQ. The only place in the selector match_conditions function the IQ is being used to compare and generate a boolean vector based in a comparison (which won't be affected by the 0.0 percentile) and in the adjusted which penalizes if a better than needed conditions are used, in equation the value is 1.0 - value, so a better IQ (lower number) returns a bigger result.

[stroncod]

Yes on match_conditions:
if required_iq = 0.0 that would always be considered bad_iq regardless of the actual condition, actually anything from 0 to 0.19 would be left out as actual_iq is binned at 0.2 . I guess is more than we also need to modify the weather service to reflect on this or just assume something lower than 0.2 is 0.2 for the sake of comparison.

[dngomez]

I think this is more a question for @bryanmiller, my initial guess is having an actual result of 0.0 is not feasible and the values of the zenith_fwhm and wavelength won't allow it.

[stroncod]

Changes were already discuss. Left approved for convenience. Thanks for the changes.

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