First version

Author: robbanl

Observer/Catalog/Productsaveafter.php

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+<?php
+
+namespace Codepeak\Productfix\Observer\Catalog;
+
+use Magento\Framework\App\ObjectManager;
+use Magento\Framework\Event\Observer;
+use Magento\Framework\Event\ObserverInterface;
+
+/**
+ * Class Productsaveafter
+ *
+ * @package Codepeak\Productfix\Observer\Catalog
+ * @author  Robert Lord <robert@codepeak.se>
+ */
+class Productsaveafter implements ObserverInterface
+{
+    /**
+     * Execute observer
+     *
+     * @param \Magento\Framework\Event\Observer $observer
+     *
+     * @return void
+     */
+    public function execute(Observer $observer)
+    {
+        if ($observer->getProduct() && $observer->getProduct()->getId()) {
+            $productId = $observer->getProduct()->getId();
+            $objectManager = \Magento\Framework\App\ObjectManager::getInstance(); // Instance of object manager
+            $resource = $objectManager->get('Magento\Framework\App\ResourceConnection');
+            $connection = $resource->getConnection();
+            $tableName = $resource->getTableName('catalog_product_entity'); //gives table name with prefix
+            $connection->query(
+                "UPDATE `" . $tableName . "` SET `updated_at` = NOW() WHERE `entity_id` =  '" . $productId . "' LIMIT 1"
+            );
+        }
+    }
+}

README.md

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+# magento2-productfix
+
+There is an issue in (at the time of writing) Magento 2.1.4 and previous versions that doesn't update the field `updated_at` in the table `catalog_product_entity` when a product is updated. This simple module uses raw SQL to force update the field.
+
+**Use this module at own risk and make sure to test it first!**
+
+## How to install
+
+After installing Magento 2, run the following commands from your Magento 2 root directory:
+
+```
+composer require codepeak/magento2-productfix
+php bin/magento cache:flush
+```
+
+## Contribute
+
+Feel free to **fork** and contribute to this module. Simply create a pull request and we'll review and merge your changes to master branch.
+
+## About Codepeak
+
+Codepeak is a Magento consultant agency located in Sweden. For more information, please visit [codepeak.se](https://codepeak.se).

composer.json

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+{
+  "name": "codepeak/magento2-productfix",
+  "description": "Solves the error with updated_at field not updating",
+  "license": "proprietary",
+  "authors": [
+    {
+      "name": "Robert Lord, Codepeak AB",
+      "email": "robert@codepeak.se"
+    }
+  ],
+  "minimum-stability": "dev",
+  "require": {},
+  "autoload": {
+    "psr-4": {
+      "Codepeak\\Productfix\\": ""
+    },
+    "files": [
+      "registration.php"
+    ]
+  }
+}

etc/events.xml

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+<?xml version="1.0" ?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
+    <event name="catalog_product_save_after">
+        <observer name="codepeakProductfixEventObserver" instance="Codepeak\Productfix\Observer\Catalog\Productsaveafter"/>
+    </event>
+</config>

etc/module.xml

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+<?xml version="1.0" ?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
+    <module name="Codepeak_Productfix" setup_version="1.0.0"/>
+</config>

registration.php

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+<?php
+
+\Magento\Framework\Component\ComponentRegistrar::register(
+    \Magento\Framework\Component\ComponentRegistrar::MODULE,
+    'Codepeak_Productfix',
+    __DIR__
+);