Sign in however you want: why registration in Letopis became its own architecture
In Letopis, sign-in is not just email+password. The product lives between the web and Telegram, so a person needs one account and several honest ways to prove access.
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Real-time systems, Rust and Python, machine learning — and a bit of life between deploys.
How I picked a database for Letopis
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I'm a MongoDB fan, and in production Letopis runs on Postgres. How I chose a database for an AI project: jurisdiction before the price list, leaky free tiers, and a graph search that pushed me to pgvector and recursive CTEs. With numbers and honest caveats.