[SPRINT 1] Création table parents_children #31
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Description
Table de liaison N:N parents ↔ enfants.
Colonnes : parent_id (FK→parents.user_id), child_id (FK→children.id).
Index : unique(parent_id,child_id).
ON DELETE CASCADE côté liaisons.
Critères d’acceptation
Contrainte d’unicité active.
Liaison parent↔enfant OK, suppression cascade OK.
DBML & Draw.io à jour.
Création table parents_childrento [SPRINT 1] Création table parents_children