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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've found that vcstool[0] is the better solution for your first example and have been using it extensively both in personal and company projects without any issues, except on occasion forgetting to commit some subpackage changes as git sometimes doesn't indicate untracked changes correctly.
The principle is similar but with explicit repos and branches defined in a config file that can then be pulled or cloned as one.
[0] https://github.com/dirk-thomas/vcstool
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