[FIX] project: improve performance for burndown chart report

Before this commit when the user wants to see the burndown chart of a
old large project then the report could take more than 20 sec to be
loaded.

This commit adds 2 indexes one on `mail_tracking_value` table
(`mail.tracking.value` model) and the other one on `mail_message` table
(`mail.message` model) to reduce the load of that report to less than
10 sec.

task-3177072

closes odoo/odoo#114114

X-original-commit: c6b355d471889634ae26a020e14c81e9a315b3de
Signed-off-by: Xavier Bol (xbo) <xbo@odoo.com>
Co-authored-by: Yannick Tivisse <yti@odoo.com>

addons/project/__init__.py

@@ -7,6 +7,8 @@ from . import report
 from . import wizard
 from . import populate
 
+from odoo.tools.sql import create_index
+
 
 def _check_exists_collaborators_for_project_sharing(env):
     """ Check if it exists at least a collaborator in a shared project
@@ -21,3 +23,13 @@ def _check_exists_collaborators_for_project_sharing(env):
 
 def _project_post_init(env):
     _check_exists_collaborators_for_project_sharing(env)
+
+    # Index to improve the performance of burndown chart.
+    project_task_stage_field_id = env['ir.model.fields']._get_ids('project.task').get('stage_id')
+    create_index(
+        env.cr,
+        'mail_tracking_value_mail_message_id_old_value_integer_task_stage',
+        env['mail.tracking.value']._table,
+        ['mail_message_id', 'old_value_integer'],
+        where=f'field={project_task_stage_field_id}'
+    )

addons/project/models/__init__.py

@@ -2,6 +2,7 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
 from . import analytic_account
+from . import mail_message
 from . import project_milestone
 from . import project_project_stage
 from . import project_task_recurrence

addons/project/models/mail_message.py

@@ -0,0 +1,18 @@
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import models
+from odoo.tools.sql import create_index
+
+
+class MailMessage(models.Model):
+    _inherit = 'mail.message'
+
+    def init(self):
+        super().init()
+        create_index(
+            self._cr,
+            'mail_message_date_res_id_id_for_burndown_chart',
+            self._table,
+            ['date', 'res_id', 'id'],
+            where="model='project.task' AND message_type='notification'"
+        )