PhoenixKitCatalogue. Schemas. ItemAttributeGroup
(PhoenixKitCatalogue v0.19.1)
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Item ↔ attribute-group assignment row.
A join table from day one: the current one-group-per-item business rule
is carried by the DB's UNIQUE (item_uuid) index (surfaced here as a
unique_constraint), so the planned multi-group future is one index
swap, not a data migration. The row's own UUID is the durable parent
future per-item narrowing state will hang off.