CH column metadata: esios.archives_i90.owner_group

# `esios.archives_i90.owner_group` Canonical brand of the real owner (majority share). Strict 4-tier cascade: manual_up_code → description_pattern → eic_longname_pattern → OMIE propietario, else NULL. No inference from agent identity. - **category**: dimension - **common_pitfalls**: - owner_group answers 'who owns the asset' — diverges from agent_group when the market is operated via a representante - NULL means owner unknown, NOT zero — filter or report explicitly - Majority-only attribution silently undercounts minority stakes; for JV-aware breakdown JOIN `esios.unit_physical_flat.owners` JSON