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Your _sql_constraints broke after an Odoo upgrade
Custom models with _sql_constraints often fail on upgrade — tuple format, naming, or how constraints are registered changed between Odoo versions. The traceback points at your model file; the fix is mechanical but easy to get wrong.
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Common questions
Why do _sql_constraints fail after upgrading Odoo?
Constraint declaration format and validation changed across versions. Each constraint tuple may need updating to match the target Odoo ORM.