diff --git a/docsource/modules180-190.rst b/docsource/modules180-190.rst
index f2846d67a336..ecd17c38a412 100644
--- a/docsource/modules180-190.rst
+++ b/docsource/modules180-190.rst
@@ -914,7 +914,7 @@ Module coverage 18.0 -> 19.0
 +---------------------------------------------------+----------------------+-------------------------------------------------+
 | product_email_template                            |                      |No DB layout changes.                            |
 +---------------------------------------------------+----------------------+-------------------------------------------------+
-| product_expiry                                    |                      |                                                 |
+| product_expiry                                    |Done                  |                                                 |
 +---------------------------------------------------+----------------------+-------------------------------------------------+
 | |del| product_images                              |                      |                                                 |
 +---------------------------------------------------+----------------------+-------------------------------------------------+
diff --git a/openupgrade_scripts/scripts/product_expiry/19.0.1.0/post-migration.py b/openupgrade_scripts/scripts/product_expiry/19.0.1.0/post-migration.py
new file mode 100644
index 000000000000..e0a06dcb5591
--- /dev/null
+++ b/openupgrade_scripts/scripts/product_expiry/19.0.1.0/post-migration.py
@@ -0,0 +1,46 @@
+# Copyright 2026 Heliconia Solutions Pvt. Ltd.
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from openupgradelib import openupgrade
+
+
+@openupgrade.migrate()
+def migrate(env, version):
+    backfill_stock_move_line_removal_date(env)
+
+
+def backfill_stock_move_line_removal_date(env):
+    """Backfill removal_date on existing move lines - core only creates the
+    column empty to avoid a MemoryError on large tables. Mirrors
+    _compute_removal_date (lot priority, use_create_lots / use_expiration_date
+    gating, picking_id -> move_id fallback for picking type)."""
+    env.cr.execute(
+        """
+        UPDATE stock_move_line sml
+        SET removal_date = CASE
+            WHEN lot.removal_date IS NOT NULL
+            THEN lot.removal_date
+            ELSE sml2.expiration_date
+                 - (COALESCE(pt.removal_time, 0) || ' days')::interval
+        END
+        FROM stock_move_line sml2
+        JOIN product_product pp ON sml2.product_id = pp.id
+        JOIN product_template pt ON pp.product_tmpl_id = pt.id
+        LEFT JOIN stock_lot lot ON sml2.lot_id = lot.id
+        LEFT JOIN stock_picking sp ON sml2.picking_id = sp.id
+        LEFT JOIN stock_move sm ON sml2.move_id = sm.id
+        LEFT JOIN stock_picking_type spt ON spt.id = COALESCE(
+            sp.picking_type_id, sm.picking_type_id
+        )
+        WHERE sml.id = sml2.id
+          AND sml.removal_date IS NULL
+          AND (
+              lot.removal_date IS NOT NULL
+              OR (
+                  COALESCE(spt.use_create_lots, FALSE) IS TRUE
+                  AND COALESCE(pt.use_expiration_date, FALSE) IS TRUE
+                  AND sml2.expiration_date IS NOT NULL
+              )
+          )
+        """
+    )
diff --git a/openupgrade_scripts/scripts/product_expiry/19.0.1.0/pre-migration.py b/openupgrade_scripts/scripts/product_expiry/19.0.1.0/pre-migration.py
new file mode 100644
index 000000000000..c61869b2219b
--- /dev/null
+++ b/openupgrade_scripts/scripts/product_expiry/19.0.1.0/pre-migration.py
@@ -0,0 +1,26 @@
+# Copyright 2026 Heliconia Solutions Pvt. Ltd.
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from openupgradelib import openupgrade
+
+
+@openupgrade.migrate()
+def migrate(env, version):
+    reassign_alert_date_activities(env)
+
+
+def reassign_alert_date_activities(env):
+    """Reassign alert-date activities to the standard To-do type
+    before the old activity type record is removed by the data sync."""
+    old_type = env.ref("product_expiry.mail_activity_type_alert_date_reached", False)
+    new_type = env.ref("mail.mail_activity_data_todo", False)
+    if old_type and new_type:
+        env.cr.execute(
+            """
+            UPDATE mail_activity
+            SET activity_type_id = %s,
+                summary = COALESCE(summary, 'Alert Date Reached')
+            WHERE activity_type_id = %s
+            """,
+            (new_type.id, old_type.id),
+        )
diff --git a/openupgrade_scripts/scripts/product_expiry/19.0.1.0/upgrade_analysis_work.txt b/openupgrade_scripts/scripts/product_expiry/19.0.1.0/upgrade_analysis_work.txt
new file mode 100644
index 000000000000..878327984d98
--- /dev/null
+++ b/openupgrade_scripts/scripts/product_expiry/19.0.1.0/upgrade_analysis_work.txt
@@ -0,0 +1,11 @@
+---Models in module 'product_expiry'---
+
+---Fields in module 'product_expiry'---
+product_expiry / stock.move.line          / removal_date (datetime)       : NEW hasdefault: compute
+
+# DONE: backfilled in post-migration, mirrors _compute_removal_date
+
+---XML records in module 'product_expiry'---
+DEL mail.activity.type: product_expiry.mail_activity_type_alert_date_reached
+
+# DONE: reassigned existing activities to mail.mail_activity_data_todo in pre-migration