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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
For searching and creating notes files you might look at my https://github.com/mclear-tools/consult-notes package, which also works with org-roam. If you do use org-roam you should check out their Templating system for note capture/creation: https://www.orgroam.com/manual.html#The-Templating-System. Of course, org capture is very powerful and can be used whether or not you use org-roam.
You might try zk. I think it checks most of those boxes. https://github.com/localauthor/zk
NOTE:
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