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Import historical data to Home Assistant
(discuss.tchncs.de)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
This forum post hints at some of the complexities involved with handling long-term data natively in HA: https://community.home-assistant.io/t/long-term-statistics-what-is-the-retention-policy-and-how-can-it-be-changed/335050
Needless to say, HA is a great tool, and its short-term monitoring capabilities are decent, but it isn't great at everything and I think that processing datasets >10 days is just not really within it's capabilities at this time.