diff --git a/alembic/versions/9e606cf1f902_new_message_field.py b/alembic/versions/9e606cf1f902_new_message_field.py
new file mode 100644
index 00000000..3947cb34
--- /dev/null
+++ b/alembic/versions/9e606cf1f902_new_message_field.py
@@ -0,0 +1,28 @@
+"""new message field
+
+Revision ID: 9e606cf1f902
+Revises: 49122cddaf65
+Create Date: 2025-09-29 12:02:05.914392
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '9e606cf1f902'
+down_revision = '49122cddaf65'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('message', sa.Column('additional_data', sa.JSON(), nullable=True), schema='cognition')
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('message', 'additional_data', schema='cognition')
+    # ### end Alembic commands ###
diff --git a/submodules/model b/submodules/model
index 9a8b5bb7..256734ff 160000
--- a/submodules/model
+++ b/submodules/model
@@ -1 +1 @@
-Subproject commit 9a8b5bb7fd05d2b6800358e25d9d9c0403375924
+Subproject commit 256734ffd3bc6373c698638bdb179b04afef2159