fix: folder migration

backend/open_webui/migrations/versions/4ace53fd72c8_update_folder_table_datetime.py

@@ -0,0 +1,67 @@
+"""Update folder table and change DateTime to BigInteger for timestamp fields
+
+Revision ID: 4ace53fd72c8
+Revises: af906e964978
+Create Date: 2024-10-23 03:00:00.000000
+
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+revision = "4ace53fd72c8"
+down_revision = "af906e964978"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # Perform safe alterations using batch operation
+    with op.batch_alter_table("folder", schema=None) as batch_op:
+        # Step 1: Remove server defaults for created_at and updated_at
+        batch_op.alter_column(
+            "created_at",
+            server_default=None,  # Removing server default
+        )
+        batch_op.alter_column(
+            "updated_at",
+            server_default=None,  # Removing server default
+        )
+
+        # Step 2: Change the column types to BigInteger for created_at
+        batch_op.alter_column(
+            "created_at",
+            type_=sa.BigInteger(),
+            existing_type=sa.DateTime(),
+            existing_nullable=False,
+            postgresql_using="extract(epoch from created_at)::bigint",  # Conversion for PostgreSQL
+        )
+
+        # Change the column types to BigInteger for updated_at
+        batch_op.alter_column(
+            "updated_at",
+            type_=sa.BigInteger(),
+            existing_type=sa.DateTime(),
+            existing_nullable=False,
+            postgresql_using="extract(epoch from updated_at)::bigint",  # Conversion for PostgreSQL
+        )
+
+
+def downgrade():
+    # Downgrade: Convert columns back to DateTime and restore defaults
+    with op.batch_alter_table("folder", schema=None) as batch_op:
+        batch_op.alter_column(
+            "created_at",
+            type_=sa.DateTime(),
+            existing_type=sa.BigInteger(),
+            existing_nullable=False,
+            server_default=sa.func.now(),  # Restoring server default on downgrade
+        )
+        batch_op.alter_column(
+            "updated_at",
+            type_=sa.DateTime(),
+            existing_type=sa.BigInteger(),
+            existing_nullable=False,
+            server_default=sa.func.now(),  # Restoring server default on downgrade
+            onupdate=sa.func.now(),  # Restoring onupdate behavior if it was there
+        )