config: add reset-wallet-transactions flag

sample-lnd.conf

@@ -226,6 +226,12 @@
 ; BE USED ON MAINNET.
 ; noseedbackup=true
 
+; Removes all transaction history from the on-chain wallet on startup, forcing a
+; full chain rescan starting at the wallet's birthday. Implements the same
+; functionality as btcwallet's dropwtxmgr command. Should be set to false after
+; successful execution to avoid rescanning on every restart of lnd.
+; reset-wallet-transactions=true
+
 ; The smallest channel size (in satoshis) that we should accept. Incoming
 ; channels smaller than this will be rejected, default value 20000.
 ; minchansize=