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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.
I have never used Overleaf, and I should probably just shut up and let someone who does use Overleaf answer, but my guess would be that you could download moderncv.cls from CTAN or github, edit it as you liked, and upload it to your project folder, and Overleaf would use that version of the file rather than its globally installed one if it finds it there.
NOTE:
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