REFACTOR external service and improve websocket training

services/forecasting/migrations/versions/a1b2c3d4e5f6_make_product_name_nullable.py

@@ -0,0 +1,32 @@
+"""make product_name nullable
+
+Revision ID: a1b2c3d4e5f6
+Revises: 706c5b559062
+Create Date: 2025-10-09 04:55:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'a1b2c3d4e5f6'
+down_revision: Union[str, None] = '706c5b559062'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # Make product_name nullable since we use inventory_product_id as the primary reference
+    op.alter_column('forecasts', 'product_name',
+               existing_type=sa.VARCHAR(length=255),
+               nullable=True)
+
+
+def downgrade() -> None:
+    # Revert to not null (requires data to be populated first)
+    op.alter_column('forecasts', 'product_name',
+               existing_type=sa.VARCHAR(length=255),
+               nullable=False)