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When fetching an AMP invoice we sometimes filter HTLCs to selected set IDs, however we always kept the full AMP state which is irrelevant as it contains state for all AMP payments. This was a side effect of UpdateInvoice needing to serialize the whole invoice when storing after an update but it is an unwanted "feature" as users will need to filter to relevant set when listing an AMP payment or subsribing to an update.
channeldb
The channeldb implements the persistent storage engine for lnd and
generically a data storage layer for the required state within the Lightning
Network. The backing storage engine is
boltdb, an embedded pure-go key-value store
based off of LMDB.
The package implements an object-oriented storage model with queries and mutations flowing through a particular object instance rather than the database itself. The storage implemented by the objects includes: open channels, past commitment revocation states, the channel graph which includes authenticated node and channel announcements, outgoing payments, and invoices
Installation and Updating
$ go get -u github.com/lightningnetwork/lnd/channeldb