migrate: better walletdb v4 migration.
migrate: better walletdb v4 migration.

decentraland/bronzeage-node,decentraland/decentraland-node,decentraland/bronzeage-node,decentraland/decentraland-node,VidaID/bcoin,VidaID/bcoin,decentraland/decentraland-node,VidaID/bcoin,decentraland/bronzeage-node