diff --git a/migrations/versions/2e4875004e12_etudiant_annotations.py b/migrations/versions/2e4875004e12_etudiant_annotations.py
new file mode 100644
index 00000000..2b06341b
--- /dev/null
+++ b/migrations/versions/2e4875004e12_etudiant_annotations.py
@@ -0,0 +1,56 @@
+"""etudiant_annotations : ajoute clé externe etudiant et moduleimpl
+
+Revision ID: 2e4875004e12
+Revises: 3fa988ff8970
+Create Date: 2024-02-11 12:10:36.743212
+
+"""
+
+from alembic import op
+
+
+# revision identifiers, used by Alembic.
+revision = "2e4875004e12"
+down_revision = "3fa988ff8970"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+
+    # Supprime les annotations orphelines
+    op.execute(
+        """DELETE FROM etud_annotations
+        WHERE etudid NOT IN (SELECT id FROM identite);
+        """
+    )
+    # Ajoute clé:
+    with op.batch_alter_table("etud_annotations", schema=None) as batch_op:
+        batch_op.create_foreign_key(None, "identite", ["etudid"], ["id"])
+
+    # Et modif liée au commit 072d013590abf715395bc987fb48de49f6750527
+    with op.batch_alter_table("notes_moduleimpl", schema=None) as batch_op:
+        batch_op.drop_constraint(
+            "notes_moduleimpl_responsable_id_fkey", type_="foreignkey"
+        )
+        batch_op.create_foreign_key(
+            None, "user", ["responsable_id"], ["id"], ondelete="SET NULL"
+        )
+
+    # cet index en trop trainait depuis longtemps...
+    with op.batch_alter_table("assiduites", schema=None) as batch_op:
+        batch_op.drop_index("ix_assiduites_user_id")
+
+
+def downgrade():
+    with op.batch_alter_table("notes_moduleimpl", schema=None) as batch_op:
+        batch_op.drop_constraint(None, type_="foreignkey")
+        batch_op.create_foreign_key(
+            "notes_moduleimpl_responsable_id_fkey", "user", ["responsable_id"], ["id"]
+        )
+
+    with op.batch_alter_table("etud_annotations", schema=None) as batch_op:
+        batch_op.drop_constraint(None, type_="foreignkey")
+
+    with op.batch_alter_table("assiduites", schema=None) as batch_op:
+        batch_op.create_index("ix_assiduites_user_id", ["user_id"], unique=False)