diff --git a/airflow-core/src/airflow/migrations/versions/0108_3_2_0_set_bundle_name_non_nullable.py b/airflow-core/src/airflow/migrations/versions/0108_3_2_0_set_bundle_name_non_nullable.py
new file mode 100644
index 0000000000000..104afbbd1e504
--- /dev/null
+++ b/airflow-core/src/airflow/migrations/versions/0108_3_2_0_set_bundle_name_non_nullable.py
@@ -0,0 +1,58 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+"""
+Set bundle_name non-nullable for legacy DAGs upgraded from 2.x.
+
+Revision ID: 35ab6b577738
+Revises: 6222ce48e289
+Create Date: 2026-03-05 00:00:00.000000
+"""
+
+from __future__ import annotations
+
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "35ab6b577738"
+down_revision = "6222ce48e289"
+branch_labels = None
+depends_on = None
+
+airflow_version = "3.2.0"
+
+
+def upgrade():
+    """Set bundle_name to 'dags-folder' for legacy DAGs with NULL bundle_name and make column non-nullable."""
+    op.execute("UPDATE dag SET bundle_name = 'dags-folder' WHERE bundle_name IS NULL")
+    with op.batch_alter_table("dag", schema=None) as batch_op:
+        batch_op.alter_column(
+            "bundle_name",
+            existing_type=sa.String(length=200),
+            nullable=False,
+        )
+
+
+def downgrade():
+    """Revert bundle_name column to nullable."""
+    with op.batch_alter_table("dag", schema=None) as batch_op:
+        batch_op.alter_column(
+            "bundle_name",
+            existing_type=sa.String(length=200),
+            nullable=True,
+        )
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