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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.
This dude caused all LND nodes to stop syncing recently with a single transaction costing less than $5 - https://twitter.com/brqgoo. Issues been patched recently. Theres others, will need to dig in order to find again.
You also talk a lot about backlog but Kaspa does have a pruning mechanism. The node only stores block data and headers from the last day and a half, up to a small amount of cryptographic proofs that can prove authenticity all the way back to genesis. You can read more about data pruning here and header pruning here.
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