Fix unique constraint error on ccc_changes_unique_index2 when deposits are included in a block

Author: foriequal0

src/migrations/20190820060110-ccc-changes-unique-index-deposit.js

@@ -0,0 +1,50 @@
+"use strict";
+
+const TABLE_NAME = "CCCChanges";
+module.exports = {
+    up: async (queryInterface, _Sequelize) => {
+        await queryInterface.removeIndex(
+            TABLE_NAME,
+            "ccc_changes_unique_index2"
+        );
+        await queryInterface.addIndex(
+            TABLE_NAME,
+            ["address", "blockNumber", "reason"],
+            {
+                unique: true,
+                name: "ccc_changes_unique_index2",
+                where: {
+                    reason: [
+                        "author",
+                        "stake",
+                        "initial_distribution",
+                        "validator"
+                    ]
+                }
+            }
+        );
+    },
+    down: async (queryInterface, _Sequelize) => {
+        await queryInterface.removeIndex(
+            TABLE_NAME,
+            "ccc_changes_unique_index2"
+        );
+        await queryInterface.addIndex(
+            TABLE_NAME,
+            ["address", "blockNumber", "reason"],
+            {
+                unique: true,
+                name: "ccc_changes_unique_index2",
+                where: {
+                    reason: [
+                        "author",
+                        "stake",
+                        "initial_distribution",
+                        "deposit",
+                        "validator"
+                    ]
+                }
+            }
+        );
+    }
+};