Data Admission Control
PreFlight — Deterministic Upstream Data Ingestion Gate
pf_v1.01 decides what enters the pipeline. Nothing is admitted without a verdict.
The idea PreFlight is built on.
Data Admission Control is a deterministic gate at the ingestion boundary that decides, mechanically, whether a dataset is structurally safe to admit — before storage, analytics, or model intake. An admission gate is a fixed contract at the boundary — it decides. One question — is this dataset structurally safe to ingest as-is?
Enforcement precedes execution. An admission decision is a trust decision, and a trust decision cannot be probabilistic. Compliance cannot accept "the AI probably caught them all." Neither can the engineer responsible when ingestion breaks. The gate is deterministic — fixed rules, no guessing.
And even if a human could scroll two million rows, the failures that matter are invisible: a stray comma. A leading-zero ID that corrupts when loaded as a number. One bad encoding byte. A "1,619" that loads as 1. They load "successfully" and are quietly wrong — and nobody knows until the bad numbers are in production.
The unit of data outgrew human inspection.
A spreadsheet used to be something a person could look at. Now it's a multi-GB CSV with millions of rows. The rule everyone still recites — check your data before you ingest it — quietly became impossible. Nobody admits it. Everybody skipped it.
The gap
Every pipeline still assumes someone checked the data. No one can. That gap is what Data Admission Control closes.
An admission gate is a step that is all four of these: known-necessary. Once manual. Now impossible at scale. Deterministic — fixed rules, no guessing.
A deterministic gate can prove itself: publish inputs, reports, hashes, and invite you to check. Ten verdicts, precomputed and hashed — no signup.
The boundary
Validation frameworks are libraries you configure inside your pipeline; profilers describe. An admission gate is a fixed contract at the boundary — it decides.
PreFlight v1.01 is the first gate. Its contract: the Deterministic Enforcement Contract v1.01.