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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
My working memory file is just a giant txt file that is synced using git to github. It's free and fast (because a text file editor like Sublime is fast).
I used Dropbox Paper and Google Docs before. Once you reach certain size, it is very very slow.
The caveat with the text file is the lack of fuzzy searching capability... but it's tolerable so far.
PS. I've built my own git sync: https://github.com/tanin47/git-notes -- it is written in Go. I've chosen Go because it can be deployed on windows, linux, and mac. Could have gone with Rust, but I don't really need speed here, so I don't need to manage my own memory.
You can do all of this in https://noteplan.co/
I used to use Trello for my entire personal KB, but the description editor grows unwieldy with large cards and you only get a few levels of nesting. It's still great software.
It took a few times to stick, but I've now fallen in love with Obsidian and am migrating everything except a large project's task-tracking system to it. The WYSIWYG editor, fully nested hierarchy and fast full-text search is fantastic and makes it better for my personal documentation.
I'm extending my Trello backup project to make the migration easier. Take a look if you're considering the same move. https://github.com/GSGBen/t2md