Oli

This likely needs to be fixed in `btcwallet`, but I guess there's also some change in `lnd` needed.

Included all changes from the PoC branch, ready for first pass review.

I made some additional changes to the custom records here: https://github.com/lightningnetwork/lnd/commit/8a4531fc9680f85040fdebce93e1fef3541482c2#diff-dcf3ed2a4ce04d1e140efd7a8d84967d7b7d04e69be69fdeb3a95c0350ac3b58 Would be nice to get those in as well.

Merging during RC as it's test-only code changes.

Updated this PR to depend on #8660 so we have everything we need in one continuous branch. @ffranr and @GeorgeTsagk please skip the first 6 commits when reviewing this PR!

This is the wrong transaction being returned. What the PR currently returns is the transaction that should be bumped. But instead we'll want to return the new transaction the sweeper...

Removed my request for review for now. Please re-request when the PR is ready.

Oh wow, I wasn't even aware there were two mechanisms for locking. Since `LockOutpoint` only does in-memory locking, perhaps we should instead refactor things to not use that anymore at...

@adam2k thanks for the PR. Do you have a specific reason for bumping the etcd client version? Looking at the code, the client version in the top level `go.mod` is...

Fixed up a bunch of things and added unit and integration tests. Ready for full review now, thought I might still add more test cases to the PR later on.