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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.
Ah ok I misunderstood your question then. The third option is what i use also. For your 4th option take a look at https://github.com/lightningequipment/circuitbreaker where an hold fee for an htlc was discussed. The base fee part could probably be used as you suggest as fourth option but I do not think something like this is implemented anywhere yet.
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