ftd — the SS7 walk
Fails-to-deliver — 23.3 million rows of trades that did not settle, a tell most shops never bother to load. The provider's own off-by-one price defect is declared on the record, so it can never leak into a signal unlabeled.
One source per sheet; every step CERTIFIED or OWED by BrainTrust Staff, matched against the book’s page.
steps certified
0 of 5
step feeders · the sources, named and counted awaiting · p.460
step match_rules · the match, DECLARED in priority order awaiting · p.461
step events · every match decision is a ROW awaiting · p.460
step survivorship · the priority sequence, RULED PER COLUMN awaiting · p.461
step back_references · the source natural keys are KEPT awaiting · p.461