~/writing

Data Pipelines

4 posts tagged data-pipelines. clear filter

October 2026
  • 13
    Agent dead letter queues
    day 28 · Data & Retrieval Engineering in 30 Days

    You'll learn why LLM consumers stop sending bad input to your dead letter queue, and how a refusal tool, a provenance envelope and abstention monitoring bring it back.

September 2026
  • 18
    How out-of-order backfill makes old data look current in your index
    day 14 · Data & Retrieval Engineering in 30 Days

    A clean backfill run with zero errors can still hand your RAG agent a policy that expired four months ago — and the bug has nothing to do with completeness.

  • 17
    Why RAG Bots Give Wrong Answers from a Stale Index
    day 13 · AI Fundamentals in 30 Days

    Most 'the AI got it wrong' tickets in a RAG system aren't model bugs at all — they're stale index entries in a hallucination costume, and a 3-question checklist tells you which one you're actually chasing.

  • 15
    How a Self-Retrying Payment Pipeline Caused a Double Charge
    day 11 · Data & Retrieval Engineering in 30 Days

    A payment DAG retried itself clean, the on-call engineer went back to sleep, and three weeks later a double-charge ticket exposed the gap every 'safe' retry hides — the same gap now sitting quietly inside your AI agents' tool calls.