Perspective user preference

You can definitely use a database connection and access it via system.db.* functions.

As for cookie storage, not sure it's a thing yet with Ignition perspective. I used the search function on this forum and found this for you though.

Perspective: How to cache information between client sessions - Ignition - Inductive Automation Forum

Cache data between Perspective sessions on same device | Voters | Inductive Automation

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