Always use UTC time for the MariaDB/MySQL session (#87583)

homeassistant/components/recorder/migration.py

@@ -996,7 +996,7 @@ def _migrate_columns_to_timestamp(
                     text(
                         "UPDATE events set time_fired_ts="
                         "IF(time_fired is NULL,0,"
-                        "UNIX_TIMESTAMP(CONVERT_TZ(time_fired,'+00:00',@@global.time_zone))"
+                        "UNIX_TIMESTAMP(time_fired)"
                         ") "
                         "where time_fired_ts is NULL "
                         "LIMIT 250000;"
@@ -1009,10 +1009,10 @@ def _migrate_columns_to_timestamp(
                     text(
                         "UPDATE states set last_updated_ts="
                         "IF(last_updated is NULL,0,"
-                        "UNIX_TIMESTAMP(CONVERT_TZ(last_updated,'+00:00',@@global.time_zone)) "
+                        "UNIX_TIMESTAMP(last_updated) "
                         "), "
                         "last_changed_ts="
-                        "UNIX_TIMESTAMP(CONVERT_TZ(last_changed,'+00:00',@@global.time_zone)) "
+                        "UNIX_TIMESTAMP(last_changed) "
                         "where last_updated_ts is NULL "
                         "LIMIT 250000;"
                     )

homeassistant/components/recorder/util.py

@@ -543,6 +543,9 @@ def setup_connection_for_dialect(
                 or MARIA_DB_107 <= version < MARIADB_WITH_FIXED_IN_QUERIES_107
                 or MARIA_DB_108 <= version < MARIADB_WITH_FIXED_IN_QUERIES_108
             )
+
+        # Ensure all times are using UTC to avoid issues with daylight savings
+        execute_on_connection(dbapi_connection, "SET time_zone = '+00:00'")
     elif dialect_name == SupportedDialect.POSTGRESQL:
         # Historically we have marked PostgreSQL as having slow range in select
         # but this may not be true for all versions. We should investigate

tests/components/recorder/test_util.py

@@ -203,9 +203,10 @@ def test_setup_connection_for_dialect_mysql(mysql_version):
 
     util.setup_connection_for_dialect(instance_mock, "mysql", dbapi_connection, True)
 
-    assert len(execute_args) == 2
+    assert len(execute_args) == 3
     assert execute_args[0] == "SET session wait_timeout=28800"
     assert execute_args[1] == "SELECT VERSION()"
+    assert execute_args[2] == "SET time_zone = '+00:00'"
 
 
 @pytest.mark.parametrize(