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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.
Then, depending on how much data we're talking about, you could consider using a database like SQLite, MySQL, Postgress, etc. for storing your data. If it's not much then by all means JSON would do fine. Could even use pydantic for easy serialization, deserialization and validation
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