Provenance tracking
Every exclusion applied and recorded.
The first deliverable is a count, not a file. Where two sources disagree, the conflict is recorded rather than resolved silently. What is handed back can be defended to whoever asks about it.
Tenure checks
Testing whether a named individual is still in the role the record claims for them.
Jurisdiction split
Separating records by the rules that apply where the person is, not where the file was built.
Contact precedence
Choosing which person represents an organisation when several qualify, by a stated rule.