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I had been building https://github.com/tenequm/pond for this exact purpose for a while, and it works like a charm in my case.

Give it a try, hope it will help you to solve your need without injecting anything in your context all the time.

Maybe?

Not really. Could be a starter, but I specifically want everything to be stored as plain text and no vector search.

plain text + fts covers all the basic needs, adding vector search, in my experience, adds more hassle and failures then helps