diff --git a/app/auth/models.py b/app/auth/models.py
index 1278d9c05..ed29772f4 100644
--- a/app/auth/models.py
+++ b/app/auth/models.py
@@ -102,6 +102,8 @@ class User(UserMixin, ScoDocModel):
     token = db.Column(db.Text(), index=True, unique=True)
     token_expiration = db.Column(db.DateTime)
 
+    # Define the back reference from User to ModuleImpl
+    modimpls = db.relationship("ModuleImpl", back_populates="responsable")
     roles = db.relationship("Role", secondary="user_role", viewonly=True)
     Permission = Permission
 
@@ -245,24 +247,26 @@ class User(UserMixin, ScoDocModel):
     def to_dict(self, include_email=True):
         """l'utilisateur comme un dict, avec des champs supplémentaires"""
         data = {
-            "date_expiration": self.date_expiration.isoformat() + "Z"
-            if self.date_expiration
-            else None,
-            "date_modif_passwd": self.date_modif_passwd.isoformat() + "Z"
-            if self.date_modif_passwd
-            else None,
-            "date_created": self.date_created.isoformat() + "Z"
-            if self.date_created
-            else None,
+            "date_expiration": (
+                self.date_expiration.isoformat() + "Z" if self.date_expiration else None
+            ),
+            "date_modif_passwd": (
+                self.date_modif_passwd.isoformat() + "Z"
+                if self.date_modif_passwd
+                else None
+            ),
+            "date_created": (
+                self.date_created.isoformat() + "Z" if self.date_created else None
+            ),
             "dept": self.dept,
             "id": self.id,
             "active": self.active,
             "cas_id": self.cas_id,
             "cas_allow_login": self.cas_allow_login,
             "cas_allow_scodoc_login": self.cas_allow_scodoc_login,
-            "cas_last_login": self.cas_last_login.isoformat() + "Z"
-            if self.cas_last_login
-            else None,
+            "cas_last_login": (
+                self.cas_last_login.isoformat() + "Z" if self.cas_last_login else None
+            ),
             "edt_id": self.edt_id,
             "status_txt": "actif" if self.active else "fermé",
             "last_seen": self.last_seen.isoformat() + "Z" if self.last_seen else None,
diff --git a/app/models/moduleimpls.py b/app/models/moduleimpls.py
index 9d2c2b2c8..97dc82e32 100644
--- a/app/models/moduleimpls.py
+++ b/app/models/moduleimpls.py
@@ -37,7 +37,10 @@ class ModuleImpl(ScoDocModel):
         index=True,
         nullable=False,
     )
-    responsable_id = db.Column("responsable_id", db.Integer, db.ForeignKey("user.id"))
+    responsable_id = db.Column(
+        "responsable_id", db.Integer, db.ForeignKey("user.id", ondelete="SET NULL")
+    )
+    responsable = db.relationship("User", back_populates="modimpls")
     # formule de calcul moyenne:
     computation_expr = db.Column(db.Text())
 
@@ -54,6 +57,7 @@ class ModuleImpl(ScoDocModel):
         lazy="dynamic",
         backref="moduleimpl",
     )
+    "enseignants du module (sans le responsable)"
 
     def __repr__(self):
         return f"<{self.__class__.__name__} {self.id} module={repr(self.module)}>"
diff --git a/app/views/notes.py b/app/views/notes.py
index b8a5f9daa..77a92e7d0 100644
--- a/app/views/notes.py
+++ b/app/views/notes.py
@@ -539,9 +539,9 @@ def ue_sharing_code():
     return sco_edit_ue.ue_sharing_code(
         ue_code=ue_code,
         ue_id=None if ((ue_id is None) or ue_id == "") else int(ue_id),
-        hide_ue_id=None
-        if ((hide_ue_id is None) or hide_ue_id == "")
-        else int(hide_ue_id),
+        hide_ue_id=(
+            None if ((hide_ue_id is None) or hide_ue_id == "") else int(hide_ue_id)
+        ),
     )
 
 
@@ -1093,7 +1093,7 @@ def edit_moduleimpl_resp(moduleimpl_id: int):
     modimpl.can_change_responsable(current_user, raise_exc=True)  # access control
     H = [
         html_sco_header.html_sem_header(
-            f"""Modification du responsable du <a href="{
+            f"""Modification du responsable du <a class="stdlink" href="{
                 url_for("notes.moduleimpl_status",
                     scodoc_dept=g.scodoc_dept, moduleimpl_id=moduleimpl_id)
             }">module {modimpl.module.titre or ""}</a>""",
@@ -1156,8 +1156,8 @@ def edit_moduleimpl_resp(moduleimpl_id: int):
             )
         )
     else:
-        responsable_id = User.get_user_from_nomplogin(tf[2]["responsable_id"])
-        if not responsable_id:
+        responsable = User.get_user_from_nomplogin(tf[2]["responsable_id"])
+        if not responsable:
             # presque impossible: tf verifie les valeurs (mais qui peuvent changer entre temps)
             return flask.redirect(
                 url_for(
@@ -1167,7 +1167,7 @@ def edit_moduleimpl_resp(moduleimpl_id: int):
                 )
             )
 
-        modimpl.responsable_id = responsable_id
+        modimpl.responsable = responsable
         db.session.add(modimpl)
         db.session.commit()
         flash("Responsable modifié")
@@ -1192,8 +1192,6 @@ def view_module_abs(moduleimpl_id, fmt="html"):
         .filter_by(dept_id=g.scodoc_dept_id)
     ).first_or_404()
 
-    debut_sem = modimpl.formsemestre.date_debut
-    fin_sem = modimpl.formsemestre.date_fin
     inscrits: list[Identite] = sorted(
         [i.etud for i in modimpl.inscriptions], key=lambda e: e.sort_key
     )
@@ -1286,9 +1284,8 @@ def formsemestre_enseignants_list(formsemestre_id, fmt="html"):
     """
     formsemestre = FormSemestre.get_formsemestre(formsemestre_id)
     # resp. de modules et charges de TD
-    sem_ens: dict[
-        int, list[ModuleImpl]
-    ] = {}  # uid : { "mods" : liste des modimpls, ... }
+    # uid : { "mods" : liste des modimpls, ... }
+    sem_ens: dict[int, list[ModuleImpl]] = {}
     modimpls = formsemestre.modimpls_sorted
     for modimpl in modimpls:
         if not modimpl.responsable_id in sem_ens: