Prevent an exception when creating databases with the same name on multiple hosts.

closes #1456

database/migrations/2019_03_02_151321_fix_unique_index_to_account_for_host.php

@@ -0,0 +1,40 @@
+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class FixUniqueIndexToAccountForHost extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('databases', function (Blueprint $table) {
+            $table->dropUnique(['database']);
+            $table->dropUnique(['username']);
+
+            $table->unique(['database_host_id', 'database']);
+            $table->unique(['database_host_id', 'username']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('databases', function (Blueprint $table) {
+            $table->dropUnique(['database_host_id', 'database']);
+            $table->dropUnique(['database_host_id', 'username']);
+
+            $table->unique(['database']);
+            $table->unique(['username']);
+        });
+    }
+}