account-financial-reporting/account_tax_balance/models/account_move_line.py

# Copyright 2017 ACSONE SA/NV
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).

from odoo import models


class AccountMoveLine(models.Model):

    _inherit = 'account.move.line'

    def init(self):
        res = super().init()
        self._cr.execute("""
            SELECT indexname FROM pg_indexes
            WHERE indexname = 'account_move_line_date_tax_line_id_idx'
        """)
        if not self._cr.fetchone():
            self._cr.execute("""
                CREATE INDEX account_move_line_date_tax_line_id_idx
                ON account_move_line (date, tax_line_id)
            """)
        return res