From 1579db1aec4ffe532040adbb5fdaa44edc134b21 Mon Sep 17 00:00:00 2001
From: Luke Imhoff <luke.imhoff@dockyard.com>
Date: Thu, 20 Dec 2018 14:14:40 -0600
Subject: [PATCH] Add ON CONFLICT to derive_transaction_forks

Fixes #1262
---
 apps/explorer/lib/explorer/chain/import/runner/blocks.ex | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/apps/explorer/lib/explorer/chain/import/runner/blocks.ex b/apps/explorer/lib/explorer/chain/import/runner/blocks.ex
index 9f24d0be7b..5917ae9968 100644
--- a/apps/explorer/lib/explorer/chain/import/runner/blocks.ex
+++ b/apps/explorer/lib/explorer/chain/import/runner/blocks.ex
@@ -133,6 +133,9 @@ defmodule Explorer.Chain.Import.Runner.Blocks do
     insert_sql = """
     INSERT INTO transaction_forks (uncle_hash, index, hash, inserted_at, updated_at)
     #{select_sql}
+    ON CONFLICT (uncle_hash, index)
+    DO UPDATE SET hash = EXCLUDED.hash
+    WHERE EXCLUDED.hash <> transaction_forks.hash
     RETURNING uncle_hash, hash
     """