Simple Auto Service
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In the early 2000s, I often found myself at a mechanic or auto-parts store needing to know the last time I performed a certain service on my vehicles. So I whipped up a tiny web-app to help track and display this information. A decade later I became bored while traveling, so I decided to clean up the old app and publish the code.
It's a super simple PHP/MySQL CRUD application based off of an ORM and Model framework that I built after learning Rails in 2008. The app itself barely has any features but I published the code publicly to show some friends my simple PHP framework.
Today, I'd just use a damned google docs spreadsheet to track this stuff.