Long-form notes on engineering decisions, race conditions, and the AI-native workflow I use to ship.
Walking the threat model on a USDT-and-bank-rail commerce stack with real money flowing through. Five migrations (027 to 031) and the load-bearing design nuance behind each.
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How a four-way write contention against a single orders row stranded a customer's USDT on-chain, and the SELECT FOR UPDATE pattern that fixed it. From the LeoHydra repo, migration 031.