BUILD 026. A CLEAN TABLE CAN HIDE. Messy history still matters.
RAW. PRESERVE THE SOURCE. Keep collection, time, owner, and permitted use.
NORMALIZE. STANDARDIZE—DO NOT ERASE. Missingness and conflict remain signals.
REVIEW. ASK WHO IS MISSING. Large coverage can still exclude.
TRACE. MAKE TRANSFORMATIONS REVERSIBLE. Every field needs a path home.
DECISION FITNESS. DO NOT CLEAN AWAY WARNINGS. Visible limits make data usable.