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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.
You can read about that in this blog post I wrote explaining it, including a handy little utility Kent C Dodds wrote to expand on this technique. (Also see Kent's video explainer for even more background info)
You can experiment with this without needing to buy a domain or pay for anything. Try deploying this demo repo to Netlify to get a your own URL shortener including the edge function which detects unfurlers and renders its custom template. It also includes Kent's netlify-shortener utility script which has instructions on how to add a system wide command to quickly shorten links for you.
Since Netlify introduced Edge Functions we've had an ideal way to add a tiny bit of logic into our link shortener which will return a page template of our own to anything looking to unfurl the URL to display its opengraph image.