I pay for both Claude and Gemini, and for months I opened each one the same way, with a paragraph explaining my background, what I'm working on, and how I want answers structured. Like a lot of people, I've ended up splitting work across different AI assistants, which means keeping two separate copies of my own context in my head. So I gave them a shared one instead. Both now read from and write to the same Postgres database. One of them uses it properly, and the other needs reminding.