Show when a device was added and last discovered (#11104)

* Add inserted column to devices table

* Added schema for devices.inserted

* Show when a device was added and last discovered

* Added collection rule for "Device added within the last 60 minutes"

database/migrations/2020_02_05_093457_add_inserted_to_devices.php

@@ -0,0 +1,34 @@
+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class AddInsertedToDevices extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('devices', function (Blueprint $table) {
+            // add inserted column after device id with a default of current_timestamp
+            $table->timestamp('inserted')->default(DB::raw('CURRENT_TIMESTAMP'))->after('device_id');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('devices', function (Blueprint $table) {
+            // revert add inserted column after device id with a default of current_timestamp
+            $table->dropColumn('inserted');
+        });
+    }
+}