diff --git a/scodoc.py b/scodoc.py
index f549e395..adbc7679 100755
--- a/scodoc.py
+++ b/scodoc.py
@@ -672,6 +672,13 @@ def migrate_abs_to_assiduites(
 ):  # migrate-abs-to-assiduites
     """Permet de migrer les absences vers le nouveau module d'assiduités"""
     tools.migrate_abs_to_assiduites(dept, morning, noon, evening)
+    # import cProfile
+    # cProfile.runctx(
+    #     f"tools.migrate_abs_to_assiduites({dept})",
+    #     {"tools": tools},
+    #     {},
+    #     "migration-nimes",
+    # )
 
 
 @app.cli.command()
diff --git a/tools/migrate_abs_to_assiduites.py b/tools/migrate_abs_to_assiduites.py
index 5eb54371..61bf1b97 100644
--- a/tools/migrate_abs_to_assiduites.py
+++ b/tools/migrate_abs_to_assiduites.py
@@ -32,21 +32,17 @@ from app.scodoc.sco_utils import (
 )
 
 
-class _Merger:
-    """pour typage"""
-
-
 class _glob:
     """variables globales du script"""
 
     DEBUG: bool = False
     PROBLEMS: dict[int, list[str]] = {}
-    CURRENT_ETU: list = []
-    MODULES: list[tuple[int, int]] = []
+    DEPT_ETUDIDS: dict[int, Identite] = {}
+    MODULES: dict[tuple[int, int]] = {}
     COMPTE: list[int, int] = []
     ERR_ETU: list[int] = []
-    MERGER_ASSI: _Merger = None
-    MERGER_JUST: _Merger = None
+    MERGER_ASSI: "_Merger" = None
+    MERGER_JUST: "_Merger" = None
 
     MORNING: time = None
     NOON: time = None
@@ -64,7 +60,9 @@ class _Merger:
         self.entry_date = abs_.entry_date
 
     def merge(self, abs_: Absence) -> bool:
-        """Fusionne les absences"""
+        """Fusionne les absences.
+        Return False si pas de fusion.
+        """
 
         if self.etudid != abs_.etudid:
             return False
@@ -218,7 +216,7 @@ def migrate_abs_to_assiduites(
     .matin: bool (0:00 -> time_pref | time_pref->23:59:59)
     .jour : date (jour de l'absence/justificatif)
     .moduleimpl_id: relation -> moduleimpl_id
-    description:str -> motif abs / raision justif
+    description:str -> motif abs / raison justif
 
     .entry_date: datetime -> timestamp d'entrée de l'abs
     .etudid: relation -> Identite
@@ -272,7 +270,7 @@ def migrate_dept(dept_name: str, stats: _Statistics, time_elapsed: Profiler):
     dept: Departement = Departement.query.filter_by(acronym=dept_name).first()
 
     if dept is None:
-        return
+        raise ValueError(f"Département inexistant: {dept_name}")
 
     etuds_id: list[int] = [etud.id for etud in dept.etudiants]
     absences_query = absences_query.filter(Absence.etudid.in_(etuds_id))
@@ -288,8 +286,8 @@ def migrate_dept(dept_name: str, stats: _Statistics, time_elapsed: Profiler):
         )
         return
 
-    _glob.CURRENT_ETU = []
-    _glob.MODULES = []
+    _glob.DEPT_ETUDIDS = {e.id for e in Identite.query.filter_by(dept_id=dept.id)}
+    _glob.MODULES = {}
     _glob.COMPTE = [0, 0]
     _glob.ERR_ETU = []
     _glob.MERGER_ASSI = None
@@ -326,8 +324,10 @@ def migrate_dept(dept_name: str, stats: _Statistics, time_elapsed: Profiler):
             )
             db.session.commit()
 
-    _glob.MERGER_ASSI.export()
-    _glob.MERGER_JUST.export()
+    if _glob.MERGER_ASSI is not None:
+        _glob.MERGER_ASSI.export()
+    if _glob.MERGER_JUST is not None:
+        _glob.MERGER_JUST.export()
 
     db.session.commit()
 
@@ -359,14 +359,15 @@ def migrate_dept(dept_name: str, stats: _Statistics, time_elapsed: Profiler):
         f"{TerminalColor.GREEN}La migration a pris {time_elapsed.elapsed():.2f} secondes {TerminalColor.RESET}"
     )
 
-    print(
-        f"{TerminalColor.RED}{statistiques['total']} absences qui n'ont pas pu être migrées."
-    )
-
     filename = f"/opt/scodoc-data/log/{datetime.now().strftime('%Y-%m-%dT%H:%M:%S')}scodoc_migration_abs_{dept_name}.json"
-    print(
-        f"Vous retrouverez un fichier json {TerminalColor.GREEN}{filename}{TerminalColor.RED} contenant les problèmes de migrations"
-    )
+    if statistiques["total"] > 0:
+        print(
+            f"{TerminalColor.RED}{statistiques['total']} absences qui n'ont pas pu être migrées."
+        )
+        print(
+            f"Vous retrouverez un fichier json {TerminalColor.GREEN}{filename}{TerminalColor.RED} contenant les problèmes de migrations"
+        )
+
     with open(
         filename,
         "w",
@@ -383,11 +384,8 @@ def migrate_dept(dept_name: str, stats: _Statistics, time_elapsed: Profiler):
 
 
 def _from_abs_to_assiduite_justificatif(_abs: Absence):
-    if _abs.etudid not in _glob.CURRENT_ETU:
-        etud: Identite = Identite.query.filter_by(id=_abs.etudid).first()
-        if etud is None:
-            raise ValueError("Etudiant inexistant")
-        _glob.CURRENT_ETU.append(_abs.etudid)
+    if _abs.etudid not in _glob.DEPT_ETUDIDS:
+        raise ValueError("Etudiant inexistant")
 
     if _abs.estabs:
         moduleimpl_id: int = _abs.moduleimpl_id
@@ -402,6 +400,7 @@ def _from_abs_to_assiduite_justificatif(_abs: Absence):
             )
             if moduleimpl_inscription is None:
                 raise ValueError("Moduleimpl_id incorrect ou étudiant non inscrit")
+            _glob.MODULES[(_abs.etudid, _abs.moduleimpl_id)] = True
 
         if _glob.MERGER_ASSI is None:
             _glob.MERGER_ASSI = _Merger(_abs, True)