[RDBMS]: Switch Back to Online migration by default for PG single to flex migrations using DMS"

src/azure-cli/azure/cli/command_modules/rdbms/_helptext_pg.py

@@ -327,6 +327,8 @@
     text: az postgres flexible-server migration update --subscription xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx --resource-group testGroup --name testserver --migration-name xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx --db-names db1 db2
   - name: Allow the migration workflow to overwrite the DB on the target.
     text: az postgres flexible-server migration update --subscription xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx --resource-group testGroup --name testserver --migration-name xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx --overwrite-dbs
+  - name: Cutover the data migration. After this is complete, subsequent updates to the source DB will not be migrated to the target.
+    text: az postgres flexible-server migration update --subscription xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx --resource-group testGroup --name testserver --migration-name xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx --cutover
   - name: This command helps in starting the data migration immediately between the source and target. Any migration scheduled for a future date and time will be cancelled.
     text: az postgres flexible-server migration update --subscription xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx --resource-group testGroup --name testserver --migration-name xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx --start-data-migration
 """

src/azure-cli/azure/cli/command_modules/rdbms/_params.py

@@ -735,6 +735,8 @@ def handle_migration_parameters(command_group, server_name_arg_type, migration_i
                                help='Space-separated list of DBs to migrate. A minimum of 1 and a maximum of 8 DBs can be specified. You can migrate more DBs concurrently using additional migrations. Note that each additional DB affects the performance of the source server.')
                     c.argument('overwrite_dbs', options_list=['--overwrite-dbs'], action='store_true', required=False,
                                help='Allow the migration workflow to overwrite the DB on the target.')
+                    c.argument('cutover', options_list=['--cutover'], action='store_true', required=False,
+                               help='Cut-over the data migration. After this is complete, subsequent updates to the source DB will not be migrated to the target.')
                     c.argument('start_data_migration', options_list=['--start-data-migration'], action='store_true', required=False,
                                help='Reschedule the data migration to start right now.')
                 elif scope == "delete":

src/azure-cli/azure/cli/command_modules/rdbms/flexible_server_custom_common.py

@@ -63,12 +63,11 @@ def migration_create_func(cmd, client, resource_group_name, server_name, propert
         raise FileOperationError("Properties file does not exist in the given location")
     with open(properties_filepath, "r") as f:
         try:
-            request_payload = json.load(f)
-            request_payload.get("properties")['TriggerCutover'] = 'true'
-            json_data = json.dumps(request_payload)
+            json_data = json.dumps(json.load(f))
         except ValueError as err:
             logger.error(err)
             raise BadRequestError("Invalid json file. Make sure that the json file content is properly formatted.")
+
     if migration_name is None:
         # Convert a UUID to a string of hex digits in standard form
         migration_name = str(uuid.uuid4())
@@ -95,7 +94,7 @@ def migration_list_func(cmd, client, resource_group_name, server_name, migration
     return r.json()
 
 
-def migration_update_func(cmd, client, resource_group_name, server_name, migration_name, setup_logical_replication=None, db_names=None, overwrite_dbs=None, start_data_migration=None):
+def migration_update_func(cmd, client, resource_group_name, server_name, migration_name, setup_logical_replication=None, db_names=None, overwrite_dbs=None, cutover=None, start_data_migration=None):
 
     subscription_id = get_subscription_id(cmd.cli_ctx)
 
@@ -119,6 +118,12 @@ def migration_update_func(cmd, client, resource_group_name, server_name, migrati
         operationSpecified = True
         properties = "{\"properties\": {\"overwriteDBsInTarget\": \"true\"} }"
 
+    if cutover is True:
+        if operationSpecified is True:
+            raise MutuallyExclusiveArgumentError("Incorrect Usage: Can only specify one update operation.")
+        operationSpecified = True
+        properties = "{\"properties\": {\"triggerCutover\": \"true\"} }"
+
     if start_data_migration is True:
         if operationSpecified is True:
             raise MutuallyExclusiveArgumentError("Incorrect Usage: Can only specify one update operation.")