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A small order-fulfillment system built to practice FastAPI microservices, JWT auth, Retrieval-Augmented Generation (RAG) for related accessories (pgvector retrieval + assistant), tool calling, distributed tracing, Docker Compose locally, and Kubernetes for production-shaped deploys.
Zero-trust, fail-closed authorization engine & REST microservice built with Python 3.11+ and SQLite STRICT. Features Ed25519 context-bound credentials, 64-bit epoch state tracking, linearizable ledger transfers with signed commit receipts, native DB trigger key reactivation guards, and append-only HMAC audit hash chain verification.