AI Engineering in Practice9 min read
Postgres state persistence for agentic systems
How to persist agent state in Postgres so conversations survive restarts. The schema, the session writer, and the idempotency rule that prevents loss.
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45 posts in total
AI Engineering in Practice9 min read
How to persist agent state in Postgres so conversations survive restarts. The schema, the session writer, and the idempotency rule that prevents loss.
AI Engineering in Practice9 min read
How a service layer in an AI agent codebase decouples business logic from HTTP routes. The pattern, the tests, and the refactor from a fat route.
AI Engineering in Practice9 min read
How to Dockerize a production AI service with multi-stage builds, layer caching, and a 150 MB runtime image. The pattern that survives real deploys.
AI Engineering in Practice9 min read
How to parse environment variables in Python AI services without os.environ.get footguns. Pydantic Settings, type coercion, and the validation layer.
AI Engineering in Practice10 min read
How to structure an agentic AI codebase so it survives growth. The 4-layer pattern, the cut lines, and the refactor that keeps a project shippable.
AI Engineering in Practice10 min read
How to instrument an agentic AI service with Prometheus. The 4 metrics that matter, the histogram trap, and the dashboard that surfaces regressions.
AI Engineering in Practice9 min read
How to survive LLM provider outages with Tenacity retries and fallback models. The retry policy, the fallback chain, and the 60-line pattern.
AI Engineering in Practice11 min read
How to sanitize agent API inputs beyond frontend validation. Prompt injection defense, payload limits, and the 4 layers every agent service needs.
AI Engineering in Practice11 min read
How to version an agentic API without breaking clients. The URL prefix pattern, the deprecation playbook, and when to ship v2.
AI Engineering in Practice10 min read
Why uv replaces pip, pip-tools, and poetry for production agentic AI services. The speed, the lockfile, and the 5-minute migration.
AI Engineering in Practice10 min read
How to wire Langfuse into an agentic AI service for full observability. The trace hierarchy, the decorator pattern, and what to log per span.
AI Engineering11 min read
How coding agents remember context across sessions. The memory store, the recall pattern, and the 3 kinds of memory every agent should keep.