01
What a mainframe data extract actually involves
Extract
Why "just send us a CSV" is the last step rather than the first, and the decisions that have to be right before it.
Notes
How this work actually goes.
Written for the person who has to make the decision. Each note covers one part of the lifecycle where the received wisdom tends to be wrong, or where the hard part is not where people expect it.
02
Why report-writer logic resists replacement
Model
The report is the specification. Converting it means output parity rather than approximation — which is what makes the undocumented rules surface.
03
What determinism buys you in legacy documentation
Enable
Documentation that is ninety-five per cent right can be worse than none, because the reader cannot tell which five per cent to distrust.
Kept current rather than dated, so nothing here goes stale on a timestamp.