What is reachable, said plainly.

Who to leave out is settled at the same moment as who to include. Contradictions between fields are surfaced instead of being averaged away. The handover is the point at which the criteria are verified, not assumed.

Record identifiers

Giving every row a stable key so a later refresh can be matched against this one.

Retention position

Stating how long we keep what was built, and what happens to it afterwards.

Validation

Checking structure and reachability before a file is used, not after.

Put the deadline on the table early; it changes what is sensible.