Lessons
From the last month
Before backfilling a historical date, audit which derived artifacts have a most-recent guard — feeds and indexes will silently rewind
static-site backfill rss data-pipeline idempotency 1k tokens
Content-hash caching of LLM output freezes out producer fixes — add a time dimension and return the retry time
llm caching api-design idempotency ux 413 tokens
Earlier
Idempotency marker on crash recovery must record last completed step, not just existence
idempotency crash-recovery pipelines distributed-systems verification 336 tokens
CLI tools with multi-step SSH workflows need transactional rollback and idempotent remote setup
python cli ssh git tailscale 637 tokens