diff --git a/oar/kao/custom_scheduling.py b/oar/kao/custom_scheduling.py
index 52e40e0c..2e0e61f9 100644
--- a/oar/kao/custom_scheduling.py
+++ b/oar/kao/custom_scheduling.py
@@ -8,7 +8,7 @@
 logger = get_logger("oar.custom_scheduling")
 
 
-def compact(itvs_slots, hy_res_rqts, hy, beginning_slotset, reverse=True):
+def compact(session, itvs_slots, hy_res_rqts, hy, beginning_slotset, reverse=True):
     """
     Given a job resource request and a set of resources this function tries to find a matching allocation.
 
@@ -78,7 +78,7 @@ def compact(itvs_slots, hy_res_rqts, hy, beginning_slotset, reverse=True):
     return result
 
 
-def spread(itvs_slots, hy_res_rqts, hy, beginning_slotset, reverse=True):
+def spread(session, itvs_slots, hy_res_rqts, hy, beginning_slotset, reverse=True):
     """
     Given a job resource request and a set of resources this function tries to find a matching allocation.
 
@@ -150,7 +150,7 @@ def spread(itvs_slots, hy_res_rqts, hy, beginning_slotset, reverse=True):
     return result
 
 
-def co_loc(itvs_slots, hy_res_rqts, hy, beginning_slotset):
+def co_loc(session, itvs_slots, hy_res_rqts, hy, beginning_slotset):
     """
     Given a job resource request and a set of resources this function tries to find a matching allocation.
 
@@ -165,10 +165,10 @@ def co_loc(itvs_slots, hy_res_rqts, hy, beginning_slotset):
     :return [ProcSet]: \
             The allocation if found, otherwise an empty :class:`procset.ProcSet`
     """
-    return spread(itvs_slots, hy_res_rqts, hy, beginning_slotset, reverse=False)
+    return spread(session, itvs_slots, hy_res_rqts, hy, beginning_slotset, reverse=False)
 
 
-def no_pref(itvs_slots, hy_res_rqts, hy, beginning_slotset):
+def no_pref(session, itvs_slots, hy_res_rqts, hy, beginning_slotset):
     """
     Given a job resource request and a set of resources this function tries to find a matching allocation.
 
@@ -183,10 +183,10 @@ def no_pref(itvs_slots, hy_res_rqts, hy, beginning_slotset):
     :return [ProcSet]: \
             The allocation if found, otherwise an empty :class:`procset.ProcSet`
     """
-    return compact(itvs_slots, hy_res_rqts, hy, beginning_slotset, reverse=False)
+    return compact(session, itvs_slots, hy_res_rqts, hy, beginning_slotset, reverse=False)
 
 
-def f_spread(itvs_slots, hy_res_rqts, hy, beginning_slotset, reverse=True):
+def f_spread(session, itvs_slots, hy_res_rqts, hy, beginning_slotset, reverse=True):
     """
     Given a job resource request and a set of resources this function tries to find a matching allocation.
 
@@ -202,18 +202,18 @@ def f_spread(itvs_slots, hy_res_rqts, hy, beginning_slotset, reverse=True):
             The allocation if found, otherwise an empty :class:`procset.ProcSet`
     """
     avail_procset = spread(
-        itvs_slots, hy_res_rqts, hy, beginning_slotset, reverse=reverse
+        session, itvs_slots, hy_res_rqts, hy, beginning_slotset, reverse=reverse
     )
 
     # if no allocation space is found (by compact policy)
     # fallback to compact/no_pref
     if len(avail_procset) == 0:
-        return compact(itvs_slots, hy_res_rqts, hy, beginning_slotset, reverse=reverse)
+        return compact(session, itvs_slots, hy_res_rqts, hy, beginning_slotset, reverse=reverse)
     else:
         return avail_procset
 
 
-def f_co_loc(itvs_slots, hy_res_rqts, hy, beginning_slotset):
+def f_co_loc(session, itvs_slots, hy_res_rqts, hy, beginning_slotset):
     """
     Given a job resource request and a set of resources this function tries to find a matching allocation.
 
@@ -228,4 +228,4 @@ def f_co_loc(itvs_slots, hy_res_rqts, hy, beginning_slotset):
     :return [ProcSet]: \
             The allocation if found, otherwise an empty :class:`procset.ProcSet`
     """
-    return f_spread(itvs_slots, hy_res_rqts, hy, beginning_slotset, reverse=False)
+    return f_spread(session, itvs_slots, hy_res_rqts, hy, beginning_slotset, reverse=False)
diff --git a/oar/kao/kamelot.py b/oar/kao/kamelot.py
index d0bef78f..269539b8 100755
--- a/oar/kao/kamelot.py
+++ b/oar/kao/kamelot.py
@@ -95,6 +95,7 @@ def internal_schedule_cycle(
         # Scheduled
         #
         schedule_id_jobs_ct(
+            session,
             all_slot_sets,
             waiting_jobs,
             resource_set.hierarchy,
@@ -196,6 +197,7 @@ def schedule_cycle(
         # Scheduled
         #
         schedule_id_jobs_ct(
+            session,
             all_slot_sets,
             waiting_jobs,
             resource_set.hierarchy,
diff --git a/oar/kao/kamelot_basic.py b/oar/kao/kamelot_basic.py
index 004f18f2..b1544846 100644
--- a/oar/kao/kamelot_basic.py
+++ b/oar/kao/kamelot_basic.py
@@ -77,7 +77,7 @@ def schedule_cycle(session, config, plt, queues=["default"]):
         # Scheduled
         #
         schedule_id_jobs_ct(
-            all_slot_sets, waiting_jobs, resource_set.hierarchy, waiting_jids, 0
+            session, all_slot_sets, waiting_jobs, resource_set.hierarchy, waiting_jids, 0
         )
 
         #
diff --git a/oar/kao/scheduling.py b/oar/kao/scheduling.py
index eea50dfc..57cb6e68 100644
--- a/oar/kao/scheduling.py
+++ b/oar/kao/scheduling.py
@@ -6,6 +6,7 @@
 from typing import Any, Tuple
 
 from procset import ProcSet
+from sqlalchemy.orm import Session
 
 from oar.kao.quotas import Quotas
 from oar.kao.slot import Slot, SlotSet, intersec_itvs_slots, intersec_ts_ph_itvs_slots
@@ -82,13 +83,14 @@ def set_slots_with_prev_scheduled_jobs(
             slot_set.split_slots_jobs(jobs_slotsets[ss_name])
 
 
-def find_resource_hierarchies_job(itvs_slots, hy_res_rqts, hy):
+def find_resource_hierarchies_job(session, itvs_slots, hy_res_rqts, hy):
     """
     Given a job resource request and a set of resources this function tries to find a matching allocation.
 
     .. note::
         This` can be override with the oar `extension <../admin/extensions.html#functions-assign-and-find>`_ mechanism.
 
+    :param session: The DB session
     :param itvs_slots: A procset of the resources available for the allocation
     :type itvs_slots: :class:`procset.ProcSet`
     :param hy_res_rqts: The job's request
@@ -118,13 +120,14 @@ def find_resource_hierarchies_job(itvs_slots, hy_res_rqts, hy):
 
 
 def find_first_suitable_contiguous_slots_quotas(
-    slots_set: SlotSet, job, res_rqt: Tuple[int, int, Any], hy, min_start_time: int
+    session: Session, slots_set: SlotSet, job, res_rqt: Tuple[int, int, Any], hy, min_start_time: int
 ):
     """
     Loop through time slices from a :py:class:`oar.kao.slot.SlotSet` that are long enough for the job's walltime.
     For each compatible time slice, call the function :py:func:`find_resource_hierarchies_job`
     to find compatible resources allocation for the job, if such allocation is found the function ends.
 
+    :param Session session: The DB session
     :param SlotSet slots_set: Slot set of the current platform
     :param Job job: The job to schedule
     :param res_rqt: The job resource request
@@ -189,6 +192,7 @@ def find_first_suitable_contiguous_slots_quotas(
             )
             # Use specialized find resource function
             itvs = job.find_func(
+                session,
                 itvs_avail,
                 hy_res_rqts,
                 hy,
@@ -197,7 +201,7 @@ def find_first_suitable_contiguous_slots_quotas(
                 **job.find_kwargs,
             )
         else:
-            itvs = find_resource_hierarchies_job(itvs_avail, hy_res_rqts, hy)
+            itvs = find_resource_hierarchies_job(session, itvs_avail, hy_res_rqts, hy)
 
         if len(itvs) != 0:
             nb_res = len(itvs & ResourceSet.default_itvs)
@@ -226,13 +230,14 @@ def find_first_suitable_contiguous_slots_quotas(
 
 
 def find_first_suitable_contiguous_slots_no_quotas(
-    slots_set: SlotSet, job, res_rqt, hy, min_start_time: int
+    session: Session, slots_set: SlotSet, job, res_rqt, hy, min_start_time: int
 ):
     """
     Loop through time slices from a :py:class:`oar.kao.slot.SlotSet` that are long enough for the job's walltime.
     For each compatible time slice, call the function :py:func:`find_resource_hierarchies_job`
     to find compatible resources allocation for the job, if such allocation is found the function ends.
 
+    :param Session session: The DB session
     :param SlotSet slots_set: Slot set of the current platform
     :param Job job: The job to schedule
     :param res_rqt: The job resource request
@@ -276,6 +281,7 @@ def find_first_suitable_contiguous_slots_no_quotas(
 
         if job.find:
             itvs = job.find_func(
+                session,
                 itvs_avail,
                 hy_res_rqts,
                 hy,
@@ -285,7 +291,7 @@ def find_first_suitable_contiguous_slots_no_quotas(
                 **job.find_kwargs,
             )
         else:
-            itvs = find_resource_hierarchies_job(itvs_avail, hy_res_rqts, hy)
+            itvs = find_resource_hierarchies_job(session, itvs_avail, hy_res_rqts, hy)
 
         if len(itvs) != 0:
             break
@@ -306,13 +312,14 @@ def find_first_suitable_contiguous_slots_no_quotas(
 
 
 def find_first_suitable_contiguous_slots(
-    slots_set: SlotSet, job, res_rqt, hy, min_start_time: int
+    session: Session, slots_set: SlotSet, job, res_rqt, hy, min_start_time: int
 ):
     """
     Loop through time slices from a :py:class:`oar.kao.slot.SlotSet` that are long enough for the job's walltime.
     For each compatible time slice, call the function :py:func:`find_resource_hierarchies_job`
     to find compatible resources allocation for the job, if such allocation is found the function ends.
 
+    :param Session session: The DB session
     :param SlotSet slots_set: Slot set of the current platform
     :param Job job: The job to schedule
     :param res_rqt: The job resource request
@@ -322,16 +329,16 @@ def find_first_suitable_contiguous_slots(
 
     if Quotas.enabled and not job.no_quotas:
         return find_first_suitable_contiguous_slots_quotas(
-            slots_set, job, res_rqt, hy, min_start_time
+            session, slots_set, job, res_rqt, hy, min_start_time
         )
 
     return find_first_suitable_contiguous_slots_no_quotas(
-        slots_set, job, res_rqt, hy, min_start_time
+        session, slots_set, job, res_rqt, hy, min_start_time
     )
 
 
 def assign_resources_mld_job_split_slots(
-    slots_set: SlotSet, job: Job, hy, min_start_time
+    session: Session, slots_set: SlotSet, job: Job, hy, min_start_time
 ):
     """
     According to a resources a :class:`SlotSet` find the time and the resources to launch a job.
@@ -345,6 +352,7 @@ def assign_resources_mld_job_split_slots(
     .. note::
         This function can be override with the oar `extension <../admin/extensions.html#functions-assign-and-find>`_ mechanism.
 
+    :param Session session: The DB session
     :param SlotSet slots_set: A :class:`SlotSet` of the current platform
     :param Job job: The job to schedule
     :param hy: \
@@ -362,7 +370,7 @@ def assign_resources_mld_job_split_slots(
     for res_rqt in job.mld_res_rqts:
         mld_id, walltime, hy_res_rqts = res_rqt
         res_set, sid_left, sid_right = find_first_suitable_contiguous_slots(
-            slots_set, job, res_rqt, hy, min_start_time
+            session, slots_set, job, res_rqt, hy, min_start_time
         )
         if len(res_set) == 0:  # no suitable time*resources found
             res_set_nfound += 1
@@ -403,11 +411,12 @@ def assign_resources_mld_job_split_slots(
     return prev_sid_left, prev_sid_right, job
 
 
-def schedule_id_jobs_ct(slots_sets, jobs, hy, id_jobs, job_security_time):
+def schedule_id_jobs_ct(session, slots_sets, jobs, hy, id_jobs, job_security_time):
     """
     Main scheduling loop with support for jobs container - can be recursive (recursion has not been tested)
     Find an allocation for each waiting jobs.
 
+    :param Session session: The DB session
     :param SlotSet slots_sets: A :class:`SlotSet` of the current platform
     :param [Job] jobs: The list of the waiting jobs to schedule
     :param hy: \
@@ -480,6 +489,7 @@ def schedule_id_jobs_ct(slots_sets, jobs, hy, id_jobs, job_security_time):
             if job.assign:
                 # Use specialized assign function
                 job.assign_func(
+                    session,
                     slots_set,
                     job,
                     hy,
@@ -488,7 +498,7 @@ def schedule_id_jobs_ct(slots_sets, jobs, hy, id_jobs, job_security_time):
                     **job.assign_kwargs,
                 )
             else:
-                assign_resources_mld_job_split_slots(slots_set, job, hy, min_start_time)
+                assign_resources_mld_job_split_slots(session, slots_set, job, hy, min_start_time)
 
             if "container" in job.types:
                 if job.types["container"] == "":
diff --git a/oar/kao/scheduling_basic.py b/oar/kao/scheduling_basic.py
index cb1f6bf8..9b24cb4d 100644
--- a/oar/kao/scheduling_basic.py
+++ b/oar/kao/scheduling_basic.py
@@ -2,12 +2,13 @@
 from typing import Tuple
 
 from procset import ProcSet
+from sqlalchemy.orm import Session
 
 from oar.kao.slot import Slot, SlotSet, intersec_itvs_slots
 from oar.lib.hierarchy import find_resource_hierarchies_scattered
 
 
-def find_resource_hierarchies_job(itvs_slots, hy_res_rqts, hy):
+def find_resource_hierarchies_job(session, itvs_slots, hy_res_rqts, hy):
     """
     Find resources in interval for all resource subrequests of a moldable
     instance of a job
@@ -31,7 +32,7 @@ def find_resource_hierarchies_job(itvs_slots, hy_res_rqts, hy):
 
 
 def find_first_suitable_contiguous_slots(
-    slots_set: SlotSet, job, res_rqt, hy
+    session: Session, slots_set: SlotSet, job, res_rqt, hy
 ) -> Tuple[ProcSet, int, int]:
     """find first_suitable_contiguous_slot"""
     (mld_id, walltime, hy_res_rqts) = res_rqt
@@ -48,7 +49,7 @@ def find_first_suitable_contiguous_slots(
     for slot_begin, slot_end in slots_set.traverse_with_width(walltime):
         # find next contiguous slots_time
         itvs_avail = intersec_itvs_slots(slots, slot_begin.id, slot_end.id)
-        itvs = find_resource_hierarchies_job(itvs_avail, hy_res_rqts, hy)
+        itvs = find_resource_hierarchies_job(session, itvs_avail, hy_res_rqts, hy)
 
         if len(itvs) != 0:
             break
@@ -59,7 +60,7 @@ def find_first_suitable_contiguous_slots(
     return (itvs, slot_begin.id, slot_end.id)
 
 
-def assign_resources_mld_job_split_slots(slots_set: SlotSet, job, hy):
+def assign_resources_mld_job_split_slots(session: Session, slots_set: SlotSet, job, hy):
     """
     According to a resources a :class:`SlotSet` find the time and the resources to launch a job.
     This function supports the moldable jobs. In case of multiple moldable job corresponding to the request
@@ -71,6 +72,7 @@ def assign_resources_mld_job_split_slots(slots_set: SlotSet, job, hy):
 
     One can replace this function using an extension of OAR.
 
+    :param Session session: The DB session
     :param ProcSet slots_set: A :class:`SlotSet` of the current platform
     :param [Job] job: The job to schedule
     :param hy: \
@@ -86,7 +88,7 @@ def assign_resources_mld_job_split_slots(slots_set: SlotSet, job, hy):
     for res_rqt in job.mld_res_rqts:
         (mld_id, walltime, hy_res_rqts) = res_rqt
         (res_set, sid_left, sid_right) = find_first_suitable_contiguous_slots(
-            slots_set, job, res_rqt, hy
+            session, slots_set, job, res_rqt, hy
         )
         # print("after find fisrt suitable")
         t_finish = slots[sid_left].b + walltime
@@ -113,7 +115,7 @@ def assign_resources_mld_job_split_slots(slots_set: SlotSet, job, hy):
     slots_set.split_slots(prev_sid_left, prev_sid_right, job)
 
 
-def schedule_id_jobs_ct(slots_sets, jobs, hy, id_jobs, security_time):
+def schedule_id_jobs_ct(session, slots_sets, jobs, hy, id_jobs, security_time):
     """
     Schedule loop with support for jobs container - can be recursive
     (recursivity has not be tested)
@@ -133,7 +135,7 @@ def schedule_id_jobs_ct(slots_sets, jobs, hy, id_jobs, security_time):
 
         # slots_set.show_slots()
 
-        assign_resources_mld_job_split_slots(slots_set, job, hy)
+        assign_resources_mld_job_split_slots(session, slots_set, job, hy)
 
         if "container" in job.types:
             Slot(