From cd2e3eebb90a36d408f0da0543a901a39324a2a8 Mon Sep 17 00:00:00 2001
From: JinGyeong Jeong <jjg@codechain.io>
Date: Wed, 13 Nov 2019 18:18:45 +0900
Subject: [PATCH] Optimize the performance of the fee-stats API

This patch changes the Transactions table's index for the optimization.
---
 ...hange-transaction-index-is-pending-type.js | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 src/migrations/20191113091514-change-transaction-index-is-pending-type.js

diff --git a/src/migrations/20191113091514-change-transaction-index-is-pending-type.js b/src/migrations/20191113091514-change-transaction-index-is-pending-type.js
new file mode 100644
index 0000000..ec9b2b1
--- /dev/null
+++ b/src/migrations/20191113091514-change-transaction-index-is-pending-type.js
@@ -0,0 +1,23 @@
+"use strict";
+
+module.exports = {
+    up: async (queryInterface, Sequelize) => {
+        await queryInterface.removeIndex("Transactions", ["isPending"]);
+        await queryInterface.addIndex("Transactions", [
+            "isPending",
+            "type",
+            "blockNumber",
+            "transactionIndex"
+        ]);
+    },
+
+    down: async (queryInterface, Sequelize) => {
+        await queryInterface.removeIndex("Transactions", [
+            "isPending",
+            "type",
+            "blockNumber",
+            "transactionIndex"
+        ]);
+        await queryInterface.addIndex("Transactions", ["isPending"]);
+    }
+};