Official first
Entry, visas, work permission, public transportation, and government rules begin with the responsible authority.
Every changing claim needs a trail.
Time-sensitive records support source URL, source name, source type, data type, review date, editorial note, and verification status.
Observed, not live
Housing and cost observations must state currency, inclusions, date, method, and limits. They are never presented as live inventory or guaranteed availability.
Missing data
Unknown or unreviewed information is identified rather than filled with an estimate merely to complete a comparison.
Editorial interpretation
A labeled judgment can help a decision, but it must not masquerade as a verified measurement.