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With our new index of sequence number to index, it is possible for more than one sequence number to point to the same hash because legacy lnd allowed duplicate payments under the same hash. We now store these payments in a nested bucket within the payments database. To allow lookup of the correct payment from an index, we require matching of the payment hash and sequence number.
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