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sqlcipher
SQLCipher is a standalone fork of SQLite that adds 256 bit AES encryption of database files and other security features.
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jsoncons
A C++, header-only library for constructing JSON and JSON-like data formats, with JSON Pointer, JSON Patch, JSON Schema, JSONPath, JMESPath, CSV, MessagePack, CBOR, BSON, UBJSON
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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 am personally using SQLite for a project that has been ordered by some future clients and it would perfectly suit your case. I strongly recommend it. Moreover, you can encrypt your entire db is you use this.
NOTE:
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Hence, a higher number means a more popular project.
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