Tuna Acisu

📊 happiness: by age group

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(see also owid/owid-issues#1581) Currently blocked as we are waiting on the full data set from the World happiness report. Description below only is relevant to the preliminary data (ca. 60...

:bar_chart: sdg: update

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For the code review - [these are all the changes](https://github.com/owid/etl/compare/sdg-helper..sdg-update) to the original code from the sdg import.