til VS rewiser-gpt

Some people create single note for each code example, like for example this TIL a repo https://github.com/jbranchaud/til`

That's more like it. This backs up the decision to add a B-Tree index for the created_at column in production. As I mentioned at the beginning of the post, adding an index like this in any production setting, but especially for a table of this size, it is important to do so concurrently and to monitor your app's health metrics during the process.

State machines are hierarchical. They can be made up of simple and composite states. Composite states have sub-states nested within them.

In all the time that I've been building and maintaining Rails apps, I've somehow never noticed that ActiveRecord attributes backed by columns with default values are nil on create.

Dump them in a github repo (like this)

I have also hooked it up this repo to a [github-action](https://github.com/mohit2152sharma/rewiser-gpt), that sends me an email of these concepts by selecting files based on spaced repetition, it also adds questions about these concepts using chatgpt.