Mojmir Vinkler

Tracking issue: improve `etl-datadiff`

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Suggested improvements: * [ ] Move datadiff to automated staging server which would give it persistence (and a new commit wouldn't be rebuilding everything from scratch) * [ ] Efficiently...

Migrations that remove columns break ETL

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ETL uses [its own ORM](https://github.com/owid/etl/blob/master/etl/grapher_model.py). The problem is that if someone removes a column with a migration in grapher, ETL breaks. This happened recently with `isBulkImport` removal that [broke fasttrack](https://owid.slack.com/archives/C6C0MCXU0/p1714050425249729)...

:bug: allow nans in ordinal types & add missing fields to `combine_variables_metadata`

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Fix for https://github.com/owid/etl/issues/2636 When working on this, I noticed that we don't combine `type` and `sort` (e.g. `dropna()` loses information about ordinal types). I fixed those fields (I haven't fixed...

:hammer: enable chart-diff to connect to production and clean up envs

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## Motivation Managing various envs (live, staging, local, etc.) has become more scattered and everyone is reinventing the wheel with their own helper functions. This PR unifies env management under...

I received feedback from a developer, @mgrabovsky, at a non-profit organization, [Facts on Climate](https://factsonclimate.org/), which uses some of our data (and might benefit from using more!). I found it interesting,...