Changelog
What has changed in this guide, and when.
A living guide is only worth more than a static one if you can see that it is alive.
2026-08
- Initial publication. Restructured from a single working document into per-concept pages, append-only registers and standalone field notes.
- Added: complexity over volume as the method-selection driver; the twelve-hour rule and modular/rolling-catch-up pattern; the two-archetype split; performance problems as a certainty rather than a risk; divergence and the burden of proof.
- Field notes added: two 35TB migrations; the Teradata proposal that never happened; the EDW that ended up driving billing; nine months to prove we were right; the weekend I called abort twice.
- Outstanding: team and roles is a placeholder; throughput and sizing figures are not yet published.