Is it safe to add extra-fields to standard PrestaShop tables?
<p>I'm creating my own store (not module to distribute, just for my own use), and I'm trying to keep hands off the core to be able to upgrade in future, so I use modules or overrides for extra-functionality.</p>

<p>But I need some more data in standart PS tables (product, addres, and so on).</p>

<p>So my question:</p>

<p><strong>is it safe to add new fields to standart tables?</strong></p>

<p>I keep in mind that PrestaShop upgrade installer could add new fields into tables too, so I give very specific names to avoid the treat of naming collision. <strong>But I wonder if upgrade installer could re-create some tables and loose my fields (maybe with converting standart data to the new format, but loosing my extra-data).</strong></p>

<p>Yes, I can create a module, my own table with extra-data and use insert/update/delete hooks to keep my data consistent, or to do the same in override of each model classes, but I'm looking for more lightweight way to add data (but to keep the core clean and upgradable).</p>

<p>Thanks in advance for your oppinion and any advices.</p>