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Coding standards said "No APIs deprecated in 17 or 18" as if that were sufficient - it isn't, because it's phrased as a non-regression check against an assumed-correct baseline, and the baseline itself (an 18-era mental model of _sql_constraints and res.groups) was already wrong for 19. Verified against a real odoo:19.0 container while building mc_education_base: _sql_constraints is replaced by per-attribute models.Constraint(sql, message), and res.groups lost category_id in favor of a new res.groups.privilege record referenced via privilege_id. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>