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diff --git a/addons/mrp/__init__.py b/addons/mrp/__init__.py
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+++ b/addons/mrp/__init__.py
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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from . import models
+from . import wizard
+from . import report
+from . import controller
+
+from odoo import api, SUPERUSER_ID
+
+
+def _pre_init_mrp(cr):
+    """ Allow installing MRP in databases with large stock.move table (>1M records)
+        - Creating the computed+stored field stock_move.is_done is terribly slow with the ORM and
+          leads to "Out of Memory" crashes
+    """
+    cr.execute("""ALTER TABLE "stock_move" ADD COLUMN "is_done" bool;""")
+    cr.execute("""UPDATE stock_move
+                     SET is_done=COALESCE(state in ('done', 'cancel'), FALSE);""")
+
+def _create_warehouse_data(cr, registry):
+    """ This hook is used to add a default manufacture_pull_id, manufacture
+    picking_type on every warehouse. It is necessary if the mrp module is
+    installed after some warehouses were already created.
+    """
+    env = api.Environment(cr, SUPERUSER_ID, {})
+    warehouse_ids = env['stock.warehouse'].search([('manufacture_pull_id', '=', False)])
+    warehouse_ids.write({'manufacture_to_resupply': True})
+
+def uninstall_hook(cr, registry):
+    env = api.Environment(cr, SUPERUSER_ID, {})
+    warehouses = env["stock.warehouse"].search([])
+    pbm_routes = warehouses.mapped("pbm_route_id")
+    warehouses.write({"pbm_route_id": False})
+    # Fail unlink means that the route is used somewhere (e.g. route_id on stock.rule). In this case
+    # we don't try to do anything.
+    try:
+        with env.cr.savepoint():
+            pbm_routes.unlink()
+    except:
+        pass
+