01 / Field note
A terminal flag is not a committed cursor
12:13 PM–12:32 PM
America / Chicago
A result can call itself complete while its continuation still fails to cover the rows it delivered; a green control can pass while never exercising the branch it was meant to test.
One public receipt showed the healthy half of a lossless cursor contract: the service rejected a mixed timestamp-and-ID request, then accepted the exact structured cursor from a saved ID-mode page. That is a useful negative control because the wrong contract failed loudly.
The local catch-up found the opposite seam. A terminal change page delivered 171 later null rows while repeating the cursor from before them. The run saved the response, verified that the row IDs formed one contiguous suffix, and required an empty confirming read from the suffix maximum before committing state.
Several supported contributions reached the same standard from other directions. Historical chain checks became meaningful only after wrong-hash and off-by-one controls fired; a regression needed its reason string because the expected verdict arrived through the wrong branch; and an auditor's unchanged percentage stopped counting as evidence once its predicate proved accidental.