fix(fusion_clock): pre-migrate re-links orphaned config-param external ids

Settings saved via set_param() have no ir_model_data; the noupdate config XML
then collides on UNIQUE(key) during -u. Pre-migrate links existing params to
their XML external id (value-preserving) so upgrades are robust. Found on the
Entech clone-verify; affects prod (35 params vs 32 xmlids).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

fusion_clock/migrations/19.0.5.0.0/pre-migrate.py

@@ -0,0 +1,65 @@
+# -*- coding: utf-8 -*-
+# Copyright 2026 Nexa Systems Inc.
+# License OPL-1 (Odoo Proprietary License v1.0)
+#
+# Defensive pre-migration: re-link orphaned fusion_clock config-parameter
+# external IDs.
+#
+# Booleans/floats saved through the Settings UI go in via set_param(), which
+# creates the ir_config_parameter row WITHOUT an ir_model_data external id. If a
+# param later also appears in the noupdate data/ir_config_parameter_data.xml,
+# a plain `-u` can't match it by external id, treats it as new, and the INSERT
+# trips the UNIQUE(key) constraint -> "Failed to load registry".
+#
+# This runs BEFORE the data files load: for every config record in the XML whose
+# param already exists but whose external id is missing, we create the external
+# id pointing at the existing param. The noupdate load then matches + skips it,
+# so the existing (possibly customised) value is preserved.
+
+import logging
+import os
+
+from lxml import etree
+
+from odoo.modules.module import get_module_path
+
+_logger = logging.getLogger(__name__)
+
+
+def migrate(cr, version):
+    module_path = get_module_path('fusion_clock')
+    if not module_path:
+        return
+    xml_path = os.path.join(module_path, 'data', 'ir_config_parameter_data.xml')
+    if not os.path.exists(xml_path):
+        return
+
+    tree = etree.parse(xml_path)
+    fixed = 0
+    for rec in tree.findall('.//record[@model="ir.config_parameter"]'):
+        xmlid = rec.get('id')
+        key_node = rec.find('./field[@name="key"]')
+        if not xmlid or key_node is None or not (key_node.text or '').strip():
+            continue
+        key = key_node.text.strip()
+
+        cr.execute("SELECT id FROM ir_config_parameter WHERE key = %s", (key,))
+        param = cr.fetchone()
+        if not param:
+            continue  # not set yet -> the noupdate load will create it cleanly
+
+        cr.execute(
+            "SELECT id FROM ir_model_data WHERE module = 'fusion_clock' AND name = %s",
+            (xmlid,))
+        if cr.fetchone():
+            continue  # already linked
+
+        cr.execute("""
+            INSERT INTO ir_model_data (module, name, model, res_id, noupdate, create_date, write_date)
+            VALUES ('fusion_clock', %s, 'ir.config_parameter', %s, true, now(), now())
+        """, (xmlid, param[0]))
+        fixed += 1
+
+    if fixed:
+        _logger.info(
+            "Fusion Clock: re-linked %s orphaned config-parameter external id(s).", fixed)