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openapi-generator
OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)
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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 not aware if a “silver bullet” solution exists but have you considered combining protobuf and OpenAPI specifications? You could start with one (say OpenAPI) as a source of truth for your models and generate the other (protobuf) from it as I know there are tools that can facilitate that generation.
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