https://0xshriram.dev/blog.html Notes on backend systems, payments reliability and the ways things fail. en Sun, 02 Aug 2026 09:00:00 +0530 https://0xshriram.dev/post.html?slug=grouped-queries https://0xshriram.dev/post.html?slug=grouped-queries Sun, 02 Aug 2026 09:00:00 +0530 Joining several independent one-to-many relations multiplies rows. Splitting the query into grouped reads took a merchant-review API from minutes to seconds. https://0xshriram.dev/post.html?slug=idempotency-two-mechanisms https://0xshriram.dev/post.html?slug=idempotency-two-mechanisms Sun, 12 Jul 2026 09:00:00 +0530 A Redis fast path, a Postgres source of truth, compare-and-set transitions, and a state for calls nobody can vouch for.