diff --git a/CHANGELOG b/CHANGELOG
index 4144434..32f6ed2 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,7 @@
 26-09-2023 (AKo): V0.6.31.0
 	- Add ephem_target2night in Agent.py
+	- Add Image table
+	- Add method to get period_id as str with the good format
 
 13-09-2023 (AKo): V0.6.31.0
 	- Change algo to find agent script (first search in obs folder then in pyros')
diff --git a/src/core/pyros_django/user_mgmt/models.py b/src/core/pyros_django/user_mgmt/models.py
index 16d0ee1..4a15ac5 100644
--- a/src/core/pyros_django/user_mgmt/models.py
+++ b/src/core/pyros_django/user_mgmt/models.py
@@ -79,6 +79,7 @@ class Country(models.Model):
 class Institute(models.Model):
     name = models.CharField(max_length=100, blank=False,
                             null=False, unique=True)
+    # quota %                            
     quota = models.IntegerField(
         validators=[MinValueValidator(0), MaxValueValidator(100)])
     #representative_user = models.ForeignKey("PyrosUser", on_delete=models.DO_NOTHING,related_name="institutes",default=1)
@@ -422,6 +423,21 @@ class Period(models.Model):
         today = timezone.now().date()
         return today >= self.notification_start_date
 
+    def get_period_id_as_str(self) -> str:
+        """
+        Return period_id as P+period_id
+
+        Returns:
+            str: P+period_id
+        """
+        period_id = str(self.id)
+        if len(period_id) < 3:
+            while len(period_id) < 3:
+                period_id = "0" + period_id
+        period_id = "P" + period_id
+        return period_id
+
+
     class Meta:
         db_table = "period"
 
@@ -520,7 +536,9 @@ class SP_Period(models.Model):
     token = models.PositiveIntegerField(default=0)
     token_allocated = models.PositiveIntegerField(default=0, blank=True)
     token_remaining = models.PositiveIntegerField(default=0, blank=True)
-    priority = models.PositiveIntegerField(default=0, blank=True)
+    # Unit PI donne un nombre de priorité (100 = alert)
+    priority = models.IntegerField(
+        validators=[MinValueValidator(0), MaxValueValidator(100)], blank=True, null=True)
 
     def is_currently_active(self):
         return self.period.is_currently_active()
--
libgit2 0.21.2