From fc97aca1b9576a1a56a29d65084edf5195df8221 Mon Sep 17 00:00:00 2001
From: Brian Stafford <buck54321@gmail.com>
Date: Sun, 27 Oct 2024 18:25:05 -0500
Subject: [PATCH] increase tx history query buffer

---
 client/asset/zec/zec.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/client/asset/zec/zec.go b/client/asset/zec/zec.go
index e1e4bb329b..bd68bb57d1 100644
--- a/client/asset/zec/zec.go
+++ b/client/asset/zec/zec.go
@@ -3346,7 +3346,8 @@ func (w *zecWallet) idUnknownTx(tx *btcjson.ListTransactionsResult) (*asset.Wall
 func (w *zecWallet) addUnknownTransactionsToHistory(tip uint64) {
 	txHistoryDB := w.txDB()
 
-	const blockQueryBuffer = 3
+	// Zcash has a maximum reorg length of 100 blocks.
+	const blockQueryBuffer = 100
 	var blockToQuery uint64
 	lastQuery := w.receiveTxLastQuery.Load()
 	if lastQuery == 0 {
@@ -3421,6 +3422,10 @@ func (w *zecWallet) syncTxHistory(tip uint64) {
 
 	txHistoryDB := w.txDB()
 	if txHistoryDB == nil {
+		// It's actually impossible to get here, because we error and return
+		// early in Connect if startTxHistoryDB returns an error, but we'll
+		// log this for good measure anyway.
+		w.log.Error("Transaction history database was not initialized")
 		return
 	}