diff --git a/components/header.py b/components/header.py
index 643a87a..dfa8f77 100644
--- a/components/header.py
+++ b/components/header.py
@@ -1,6 +1,7 @@
 import streamlit as st
 from config import ENV
 from utils.translations import _
+from utils.persistance import get_session_id
 
 
 def afficher_entete():
@@ -11,7 +12,7 @@ def afficher_entete():
     """
 
     if ENV == "dev":
-        header += f"<p>🔧 {_("app.dev_mode")}</p>"
+        header += f"<p>🔧 {_("app.dev_mode")} Session : {get_session_id()}</p>"
     else:
         header += f"<p>{_("header.subtitle")}</p>"
 
diff --git a/fabnum.py b/fabnum.py
index 7b148d2..9051cda 100644
--- a/fabnum.py
+++ b/fabnum.py
@@ -1,5 +1,8 @@
+import utils.persistance
+utils.persistance.update_session_paths()
+
 import streamlit as st
-from utils.persistance import get_champ_statut
+from utils.persistance import get_champ_statut, get_session_id
 
 st.set_page_config(
     page_title="Fabnum – Analyse de chaîne",
@@ -88,8 +91,6 @@ init_translations()
 # Pour tester d'autres langues, décommenter cette ligne :
 set_language("fr")
 
-session_id = st.context.headers.get("x-session-id")
-
 #
 # Important
 # Avec Selinux, il faut mettre les bons droits :
@@ -97,6 +98,7 @@ session_id = st.context.headers.get("x-session-id")
 # sudo semanage fcontext -a -t var_log_t '/var/log/nginx/fabnum-public\.access\.log'
 # sudo restorecon -v /var/log/nginx/fabnum-public.access.log
 #
+session_id = get_session_id()
 def get_total_bytes_for_session(session_id):
     total_bytes = 0
     try:
@@ -158,7 +160,7 @@ def fermer_page():
     st.markdown("""</section>""", unsafe_allow_html=True)
     st.markdown("</main>", unsafe_allow_html=True)
 
-    total_bytes = get_total_bytes_for_session(session_id)
+    total_bytes = get_total_bytes_for_session(get_session_id())
 
     afficher_pied_de_page()
     afficher_impact(total_bytes)
@@ -176,7 +178,6 @@ ia_nalyse_tab = _("navigation.ia_nalyse")
 plan_d_action_tab = _("navigation.plan_d_action")
 visualisations_tab = _("navigation.visualisations")
 
-from utils.persistance import get_champ_statut
 navigation_onglet = get_champ_statut("navigation_onglet")
 
 if navigation_onglet == instructions_tab:
diff --git a/utils/persistance.py b/utils/persistance.py
index c27bca8..6e012ae 100644
--- a/utils/persistance.py
+++ b/utils/persistance.py
@@ -8,22 +8,17 @@ from pathlib import Path
 
 load_dotenv(".env")
 
-def initialise():
-    SAVE_SESSIONS_PATH.mkdir(parents=True, exist_ok=True)
-
-def get_session_id():
-    if "session_id" not in st.session_state:
-        session_id = st.context.headers.get("x-session-id", "anonymous")
-        st.session_state["session_id"] = session_id
-    else:
-        session_id = st.session_state["session_id"]
+def get_session_id() -> str:
+    session_id = st.context.headers.get("x-session-id", "anonymous")
     return session_id
 
-SAVE_STATUT = os.getenv("SAVE_STATUT", "statut_general.json")
-session_id = get_session_id()
-SAVE_SESSIONS_PATH = Path(f"tmp/sessions/{session_id}")
-SAVE_STATUT_PATH = SAVE_SESSIONS_PATH / SAVE_STATUT
-initialise()
+def update_session_paths():
+    global SAVE_STATUT, SAVE_SESSIONS_PATH, SAVE_STATUT_PATH
+
+    SAVE_STATUT = os.getenv("SAVE_STATUT", "statut_general.json")
+    SAVE_SESSIONS_PATH = Path(f"tmp/sessions/{get_session_id()}")
+    SAVE_SESSIONS_PATH.mkdir(parents=True, exist_ok=True)
+    SAVE_STATUT_PATH = SAVE_SESSIONS_PATH / SAVE_STATUT
 
 def _maj_champ(fichier, cle: str, contenu: str = "") -> bool: