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fasten-onprem
Fasten is an open-source, self-hosted, personal/family electronic medical record aggregator, designed to integrate with 100,000's of insurances/hospitals/clinics
I'm not sure if it fits all your requirements, but there's Fasten Health
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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https://github.com/monicahq/monica [will allow you to have notes, daily notes, daily reminders, etc against persons]
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Baby Buddy
A :baby: buddy to help caregivers track sleep, feedings, diaper changes, tummy time and more to learn about and predict baby's needs without (as much) guess work.
https://github.com/babybuddy/babybuddy [could probably be amended to use for anyone]