[FIX] stock: Add index for free reservation

Free reservation is called each time an extra quantity is
used on a move (and for each immediate transfer). It means
that the function is called many times on a database with an
inventoy activity. Also _free_reservation method do a search
on fields that are not indexed, and is slow on large database.

This index is specific to _free_reservation.
On a live database with an important stock, the queries dropped from 265ms
to 1.5ms.

closes odoo/odoo#64327

X-original-commit: 74ea87d0a354b7414afb76d98ed39ecde45a8fb1
Signed-off-by: Arnold Moyaux <amoyaux@users.noreply.github.com>

addons/stock/models/stock_move_line.py

@@ -3,7 +3,7 @@
 
 from collections import Counter
 
-from odoo import _, api, fields, models
+from odoo import _, api, fields, tools, models
 from odoo.exceptions import UserError, ValidationError
 from odoo.tools import OrderedSet
 from odoo.tools.float_utils import float_compare, float_is_zero, float_round
@@ -175,6 +175,15 @@ class StockMoveLine(models.Model):
                 res['warning'] = {'title': _('Warning'), 'message': message}
         return res
 
+    def init(self):
+        if not tools.index_exists(self._cr, 'stock_move_line_free_reservation_index'):
+            self._cr.execute("""
+                CREATE INDEX stock_move_line_free_reservation_index
+                ON
+                    stock_move_line (id, company_id, product_id, lot_id, location_id, owner_id, package_id)
+                WHERE
+                    (state IS NULL OR state NOT IN ('cancel', 'done')) AND product_qty > 0""")
+
     @api.model_create_multi
     def create(self, vals_list):
         for vals in vals_list: