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SilverStripe
Silverstripe CMS - this is a module for Silverstripe Framework rather than a standalone app. Use https://github.com/silverstripe/silverstripe-installer/ to set this up.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Check out Primo it’s FOSS & easy for nontechnical content editors, but you won’t be able to use Hugo with it
How about SilverStripe. It is a good developer experience, but has a really good admin GUI out of the box. Not something you can host on S3 (just like other suggestions)
If you've got the content in .md and .json files and you just need a way to add or modify that content, I would recommend you look into decap CMS (formerly netlify CMS)