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af1b8a549d
This field isn't optional. It was introduced in 5ed31b1030176374d4184fee0b80ae7679e0e355 which was part of release 0.4.0. This release contained breaking database changes, so it is safe to assume that from there on the field is always populated. If there would still be empty payment request fields in the wild, users would also experience issues with ListInvoices. ListInvoices decodes the payment request.
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