diff --git a/account_financial_report_qweb/__manifest__.py b/account_financial_report_qweb/__manifest__.py
index 918c50f4..b55996e7 100644
--- a/account_financial_report_qweb/__manifest__.py
+++ b/account_financial_report_qweb/__manifest__.py
@@ -5,7 +5,7 @@
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 {
     'name': 'QWeb Financial Reports',
-    'version': '10.0.1.5.2',
+    'version': '10.0.1.5.3',
     'category': 'Reporting',
     'summary': 'OCA Financial Reports',
     'author': 'Camptocamp SA,'
diff --git a/account_financial_report_qweb/report/__init__.py b/account_financial_report_qweb/report/__init__.py
index cc89a3d7..971b7e53 100644
--- a/account_financial_report_qweb/report/__init__.py
+++ b/account_financial_report_qweb/report/__init__.py
@@ -4,6 +4,7 @@
 # © 2016 Julien Coux (Camptocamp)
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).-
 
+from . import abstract_report
 from . import abstract_report_xlsx
 from . import aged_partner_balance
 from . import aged_partner_balance_xlsx
diff --git a/account_financial_report_qweb/report/abstract_report.py b/account_financial_report_qweb/report/abstract_report.py
new file mode 100644
index 00000000..961f343d
--- /dev/null
+++ b/account_financial_report_qweb/report/abstract_report.py
@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+# Copyright 2018 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo import models
+
+
+class AbstractReport(models.AbstractModel):
+    _name = 'report_qweb_abstract'
+
+    def _transient_clean_rows_older_than(self, seconds):
+        assert self._transient, \
+            "Model %s is not transient, it cannot be vacuumed!" % self._name
+        # Never delete rows used in last 5 minutes
+        seconds = max(seconds, 300)
+        query = """
+DELETE FROM """ + self._table + """
+WHERE
+    COALESCE(write_date, create_date, (now() at time zone 'UTC'))::timestamp
+    < ((now() at time zone 'UTC') - interval %s)
+"""
+        self.env.cr.execute(query, ("%s seconds" % seconds,))
diff --git a/account_financial_report_qweb/report/aged_partner_balance.py b/account_financial_report_qweb/report/aged_partner_balance.py
index d6f1a81c..7f225ffc 100644
--- a/account_financial_report_qweb/report/aged_partner_balance.py
+++ b/account_financial_report_qweb/report/aged_partner_balance.py
@@ -19,6 +19,7 @@ class AgedPartnerBalanceReport(models.TransientModel):
     """
 
     _name = 'report_aged_partner_balance_qweb'
+    _inherit = 'report_qweb_abstract'
 
     # Filters fields, used for data computation
     date_at = fields.Date()
@@ -41,6 +42,7 @@ class AgedPartnerBalanceReport(models.TransientModel):
 class AgedPartnerBalanceReportAccount(models.TransientModel):
 
     _name = 'report_aged_partner_balance_qweb_account'
+    _inherit = 'report_qweb_abstract'
     _order = 'code ASC'
 
     report_id = fields.Many2one(
@@ -84,6 +86,7 @@ class AgedPartnerBalanceReportAccount(models.TransientModel):
 class AgedPartnerBalanceReportPartner(models.TransientModel):
 
     _name = 'report_aged_partner_balance_qweb_partner'
+    _inherit = 'report_qweb_abstract'
 
     report_account_id = fields.Many2one(
         comodel_name='report_aged_partner_balance_qweb_account',
@@ -128,6 +131,7 @@ ORDER BY
 class AgedPartnerBalanceReportLine(models.TransientModel):
 
     _name = 'report_aged_partner_balance_qweb_line'
+    _inherit = 'report_qweb_abstract'
 
     report_partner_id = fields.Many2one(
         comodel_name='report_aged_partner_balance_qweb_partner',
@@ -149,6 +153,7 @@ class AgedPartnerBalanceReportLine(models.TransientModel):
 class AgedPartnerBalanceReportMoveLine(models.TransientModel):
 
     _name = 'report_aged_partner_balance_qweb_move_line'
+    _inherit = 'report_qweb_abstract'
 
     report_partner_id = fields.Many2one(
         comodel_name='report_aged_partner_balance_qweb_partner',
diff --git a/account_financial_report_qweb/report/general_ledger.py b/account_financial_report_qweb/report/general_ledger.py
index 813e6758..33824bf0 100644
--- a/account_financial_report_qweb/report/general_ledger.py
+++ b/account_financial_report_qweb/report/general_ledger.py
@@ -22,6 +22,7 @@ class GeneralLedgerReport(models.TransientModel):
     """
 
     _name = 'report_general_ledger_qweb'
+    _inherit = 'report_qweb_abstract'
 
     # Filters fields, used for data computation
     date_from = fields.Date()
@@ -72,6 +73,7 @@ class GeneralLedgerReport(models.TransientModel):
 class GeneralLedgerReportAccount(models.TransientModel):
 
     _name = 'report_general_ledger_qweb_account'
+    _inherit = 'report_qweb_abstract'
     _order = 'code ASC'
 
     report_id = fields.Many2one(
@@ -116,6 +118,7 @@ class GeneralLedgerReportAccount(models.TransientModel):
 class GeneralLedgerReportPartner(models.TransientModel):
 
     _name = 'report_general_ledger_qweb_partner'
+    _inherit = 'report_qweb_abstract'
 
     report_account_id = fields.Many2one(
         comodel_name='report_general_ledger_qweb_account',
@@ -164,6 +167,7 @@ ORDER BY
 class GeneralLedgerReportMoveLine(models.TransientModel):
 
     _name = 'report_general_ledger_qweb_move_line'
+    _inherit = 'report_qweb_abstract'
 
     report_account_id = fields.Many2one(
         comodel_name='report_general_ledger_qweb_account',
diff --git a/account_financial_report_qweb/report/journal_report.py b/account_financial_report_qweb/report/journal_report.py
index 5f873a78..1331c4d0 100644
--- a/account_financial_report_qweb/report/journal_report.py
+++ b/account_financial_report_qweb/report/journal_report.py
@@ -10,6 +10,7 @@ DIGITS = (16, 2)
 class ReportJournalQweb(models.TransientModel):
 
     _name = 'report_journal_qweb'
+    _inherit = 'report_qweb_abstract'
 
     date_from = fields.Date(
         required=True
@@ -622,6 +623,7 @@ class ReportJournalQweb(models.TransientModel):
 class ReportJournalQwebJournal(models.TransientModel):
 
     _name = 'report_journal_qweb_journal'
+    _inherit = 'report_qweb_abstract'
 
     name = fields.Char(
         required=True,
@@ -664,6 +666,7 @@ class ReportJournalQwebJournal(models.TransientModel):
 class ReportJournalQwebMove(models.TransientModel):
 
     _name = 'report_journal_qweb_move'
+    _inherit = 'report_qweb_abstract'
 
     report_id = fields.Many2one(
         comodel_name='report_journal_qweb',
@@ -695,6 +698,7 @@ class ReportJournalQwebMove(models.TransientModel):
 class ReportJournalQwebMoveLine(models.TransientModel):
 
     _name = 'report_journal_qweb_move_line'
+    _inherit = 'report_qweb_abstract'
     _order = 'partner_id desc, account_id desc'
 
     report_id = fields.Many2one(
@@ -760,6 +764,7 @@ class ReportJournalQwebMoveLine(models.TransientModel):
 class ReportJournalQwebReportTaxLine(models.TransientModel):
 
     _name = 'report_journal_qweb_report_tax_line'
+    _inherit = 'report_qweb_abstract'
     _order = 'tax_code'
 
     report_id = fields.Many2one(
diff --git a/account_financial_report_qweb/report/open_items.py b/account_financial_report_qweb/report/open_items.py
index 2c52f559..17f42cab 100644
--- a/account_financial_report_qweb/report/open_items.py
+++ b/account_financial_report_qweb/report/open_items.py
@@ -17,6 +17,7 @@ class OpenItemsReport(models.TransientModel):
     """
 
     _name = 'report_open_items_qweb'
+    _inherit = 'report_qweb_abstract'
 
     # Filters fields, used for data computation
     date_at = fields.Date()
@@ -37,6 +38,7 @@ class OpenItemsReport(models.TransientModel):
 class OpenItemsReportAccount(models.TransientModel):
 
     _name = 'report_open_items_qweb_account'
+    _inherit = 'report_qweb_abstract'
     _order = 'code ASC'
 
     report_id = fields.Many2one(
@@ -70,6 +72,7 @@ class OpenItemsReportAccount(models.TransientModel):
 class OpenItemsReportPartner(models.TransientModel):
 
     _name = 'report_open_items_qweb_partner'
+    _inherit = 'report_qweb_abstract'
 
     report_account_id = fields.Many2one(
         comodel_name='report_open_items_qweb_account',
@@ -114,6 +117,7 @@ ORDER BY
 class OpenItemsReportMoveLine(models.TransientModel):
 
     _name = 'report_open_items_qweb_move_line'
+    _inherit = 'report_qweb_abstract'
 
     report_partner_id = fields.Many2one(
         comodel_name='report_open_items_qweb_partner',
diff --git a/account_financial_report_qweb/report/trial_balance.py b/account_financial_report_qweb/report/trial_balance.py
index 9c2c3d8f..39687569 100644
--- a/account_financial_report_qweb/report/trial_balance.py
+++ b/account_financial_report_qweb/report/trial_balance.py
@@ -17,6 +17,7 @@ class TrialBalanceReport(models.TransientModel):
     """
 
     _name = 'report_trial_balance_qweb'
+    _inherit = 'report_qweb_abstract'
 
     # Filters fields, used for data computation
     date_from = fields.Date()
@@ -47,6 +48,7 @@ class TrialBalanceReport(models.TransientModel):
 class TrialBalanceReportAccount(models.TransientModel):
 
     _name = 'report_trial_balance_qweb_account'
+    _inherit = 'report_qweb_abstract'
     _order = 'code ASC'
 
     report_id = fields.Many2one(
@@ -87,6 +89,7 @@ class TrialBalanceReportAccount(models.TransientModel):
 class TrialBalanceReportPartner(models.TransientModel):
 
     _name = 'report_trial_balance_qweb_partner'
+    _inherit = 'report_qweb_abstract'
 
     report_account_id = fields.Many2one(
         comodel_name='report_trial_balance_qweb_account',