enh: channel file upload

backend/open_webui/migrations/versions/7826ab40b532_update_file_table.py

@@ -0,0 +1,26 @@
+"""Update file table
+
+Revision ID: 7826ab40b532
+Revises: 57c599a3cb57
+Create Date: 2024-12-23 03:00:00.000000
+
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+revision = "7826ab40b532"
+down_revision = "57c599a3cb57"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.add_column(
+        "file",
+        sa.Column("access_control", sa.JSON(), nullable=True),
+    )
+
+
+def downgrade():
+    op.drop_column("file", "access_control")