diff --git a/migrations/05_triggers.sql b/migrations/05_triggers.sql
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+++ b/migrations/05_triggers.sql
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+-- =============================================
+-- 05_triggers.sql : Timestamps automatiques
+-- - Ajoute (si absent) cree_le DEFAULT now() et modifie_le DEFAULT now()
+-- - Crée un trigger BEFORE UPDATE pour mettre à jour modifie_le
+-- - Idempotent (DROP TRIGGER IF EXISTS / IF NOT EXISTS)
+-- A exécuter après 01_init.sql, 02_indexes.sql, 03_checks.sql
+-- =============================================
+
+-- 1) Fonction unique de mise à jour du timestamp
+CREATE OR REPLACE FUNCTION set_modifie_le()
+RETURNS TRIGGER AS $$
+BEGIN
+  NEW.modifie_le := NOW();
+  RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+-- Helper macro-like: pour chaque table, s'assurer des colonnes & trigger
+-- (on ne peut pas faire de macro, donc on répète pour chaque table)
+
+-- Liste des tables concernées :
+-- utilisateurs, assistantes_maternelles, parents, enfants, enfants_parents,
+-- dossiers, messages, contrats, avenants_contrats, evenements,
+-- signalements_bugs, uploads, notifications, validations
+
+-- ========== UTILISATEURS
+ALTER TABLE utilisateurs
+  ADD COLUMN IF NOT EXISTS cree_le     TIMESTAMP DEFAULT NOW(),
+  ADD COLUMN IF NOT EXISTS modifie_le  TIMESTAMP DEFAULT NOW();
+DROP TRIGGER IF EXISTS trg_utilisateurs_set_modifie_le ON utilisateurs;
+CREATE TRIGGER trg_utilisateurs_set_modifie_le
+BEFORE UPDATE ON utilisateurs
+FOR EACH ROW EXECUTE FUNCTION set_modifie_le();
+
+-- ========== ASSISTANTES_MATERNELLES
+ALTER TABLE assistantes_maternelles
+  ADD COLUMN IF NOT EXISTS cree_le     TIMESTAMP DEFAULT NOW(),
+  ADD COLUMN IF NOT EXISTS modifie_le  TIMESTAMP DEFAULT NOW();
+DROP TRIGGER IF EXISTS trg_am_set_modifie_le ON assistantes_maternelles;
+CREATE TRIGGER trg_am_set_modifie_le
+BEFORE UPDATE ON assistantes_maternelles
+FOR EACH ROW EXECUTE FUNCTION set_modifie_le();
+
+-- ========== PARENTS
+ALTER TABLE parents
+  ADD COLUMN IF NOT EXISTS cree_le     TIMESTAMP DEFAULT NOW(),
+  ADD COLUMN IF NOT EXISTS modifie_le  TIMESTAMP DEFAULT NOW();
+DROP TRIGGER IF EXISTS trg_parents_set_modifie_le ON parents;
+CREATE TRIGGER trg_parents_set_modifie_le
+BEFORE UPDATE ON parents
+FOR EACH ROW EXECUTE FUNCTION set_modifie_le();
+
+-- ========== ENFANTS
+ALTER TABLE enfants
+  ADD COLUMN IF NOT EXISTS cree_le     TIMESTAMP DEFAULT NOW(),
+  ADD COLUMN IF NOT EXISTS modifie_le  TIMESTAMP DEFAULT NOW();
+DROP TRIGGER IF EXISTS trg_enfants_set_modifie_le ON enfants;
+CREATE TRIGGER trg_enfants_set_modifie_le
+BEFORE UPDATE ON enfants
+FOR EACH ROW EXECUTE FUNCTION set_modifie_le();
+
+-- ========== ENFANTS_PARENTS (table de liaison)
+ALTER TABLE enfants_parents
+  ADD COLUMN IF NOT EXISTS cree_le     TIMESTAMP DEFAULT NOW(),
+  ADD COLUMN IF NOT EXISTS modifie_le  TIMESTAMP DEFAULT NOW();
+DROP TRIGGER IF EXISTS trg_enfants_parents_set_modifie_le ON enfants_parents;
+CREATE TRIGGER trg_enfants_parents_set_modifie_le
+BEFORE UPDATE ON enfants_parents
+FOR EACH ROW EXECUTE FUNCTION set_modifie_le();
+
+-- ========== DOSSIERS
+ALTER TABLE dossiers
+  ADD COLUMN IF NOT EXISTS cree_le     TIMESTAMP DEFAULT NOW(),
+  ADD COLUMN IF NOT EXISTS modifie_le  TIMESTAMP DEFAULT NOW();
+DROP TRIGGER IF EXISTS trg_dossiers_set_modifie_le ON dossiers;
+CREATE TRIGGER trg_dossiers_set_modifie_le
+BEFORE UPDATE ON dossiers
+FOR EACH ROW EXECUTE FUNCTION set_modifie_le();
+
+-- ========== MESSAGES
+ALTER TABLE messages
+  ADD COLUMN IF NOT EXISTS cree_le     TIMESTAMP DEFAULT NOW(),
+  ADD COLUMN IF NOT EXISTS modifie_le  TIMESTAMP DEFAULT NOW();
+DROP TRIGGER IF EXISTS trg_messages_set_modifie_le ON messages;
+CREATE TRIGGER trg_messages_set_modifie_le
+BEFORE UPDATE ON messages
+FOR EACH ROW EXECUTE FUNCTION set_modifie_le();
+
+-- ========== CONTRATS
+ALTER TABLE contrats
+  ADD COLUMN IF NOT EXISTS cree_le     TIMESTAMP DEFAULT NOW(),
+  ADD COLUMN IF NOT EXISTS modifie_le  TIMESTAMP DEFAULT NOW();
+DROP TRIGGER IF EXISTS trg_contrats_set_modifie_le ON contrats;
+CREATE TRIGGER trg_contrats_set_modifie_le
+BEFORE UPDATE ON contrats
+FOR EACH ROW EXECUTE FUNCTION set_modifie_le();
+
+-- ========== AVENANTS_CONTRATS
+ALTER TABLE avenants_contrats
+  ADD COLUMN IF NOT EXISTS cree_le     TIMESTAMP DEFAULT NOW(),
+  ADD COLUMN IF NOT EXISTS modifie_le  TIMESTAMP DEFAULT NOW();
+DROP TRIGGER IF EXISTS trg_avenants_contrats_set_modifie_le ON avenants_contrats;
+CREATE TRIGGER trg_avenants_contrats_set_modifie_le
+BEFORE UPDATE ON avenants_contrats
+FOR EACH ROW EXECUTE FUNCTION set_modifie_le();
+
+-- ========== EVENEMENTS
+ALTER TABLE evenements
+  ADD COLUMN IF NOT EXISTS cree_le     TIMESTAMP DEFAULT NOW(),
+  ADD COLUMN IF NOT EXISTS modifie_le  TIMESTAMP DEFAULT NOW();
+DROP TRIGGER IF EXISTS trg_evenements_set_modifie_le ON evenements;
+CREATE TRIGGER trg_evenements_set_modifie_le
+BEFORE UPDATE ON evenements
+FOR EACH ROW EXECUTE FUNCTION set_modifie_le();
+
+-- ========== SIGNALEMENTS_BUGS
+ALTER TABLE signalements_bugs
+  ADD COLUMN IF NOT EXISTS cree_le     TIMESTAMP DEFAULT NOW(),
+  ADD COLUMN IF NOT EXISTS modifie_le  TIMESTAMP DEFAULT NOW();
+DROP TRIGGER IF EXISTS trg_signalements_bugs_set_modifie_le ON signalements_bugs;
+CREATE TRIGGER trg_signalements_bugs_set_modifie_le
+BEFORE UPDATE ON signalements_bugs
+FOR EACH ROW EXECUTE FUNCTION set_modifie_le();
+
+-- ========== UPLOADS
+ALTER TABLE uploads
+  ADD COLUMN IF NOT EXISTS cree_le     TIMESTAMP DEFAULT NOW(),
+  ADD COLUMN IF NOT EXISTS modifie_le  TIMESTAMP DEFAULT NOW();
+DROP TRIGGER IF EXISTS trg_uploads_set_modifie_le ON uploads;
+CREATE TRIGGER trg_uploads_set_modifie_le
+BEFORE UPDATE ON uploads
+FOR EACH ROW EXECUTE FUNCTION set_modifie_le();
+
+-- ========== NOTIFICATIONS
+ALTER TABLE notifications
+  ADD COLUMN IF NOT EXISTS cree_le     TIMESTAMP DEFAULT NOW(),
+  ADD COLUMN IF NOT EXISTS modifie_le  TIMESTAMP DEFAULT NOW();
+DROP TRIGGER IF EXISTS trg_notifications_set_modifie_le ON notifications;
+CREATE TRIGGER trg_notifications_set_modifie_le
+BEFORE UPDATE ON notifications
+FOR EACH ROW EXECUTE FUNCTION set_modifie_le();
+
+-- ========== VALIDATIONS
+ALTER TABLE validations
+  ADD COLUMN IF NOT EXISTS cree_le     TIMESTAMP DEFAULT NOW(),
+  ADD COLUMN IF NOT EXISTS modifie_le  TIMESTAMP DEFAULT NOW();
+DROP TRIGGER IF EXISTS trg_validations_set_modifie_le ON validations;
+CREATE TRIGGER trg_validations_set_modifie_le
+BEFORE UPDATE ON validations
+FOR EACH ROW EXECUTE FUNCTION set_modifie_le();