feat(sub): subscription logic (pre release)

alembic/versions/bc424721d767_order_user_id_not_unique.py

@@ -0,0 +1,32 @@
+"""order.user_id -> NOT UNIQUE
+
+Revision ID: bc424721d767
+Revises: 0ea5625b4913
+Create Date: 2026-08-02 13:23:23.626697
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'bc424721d767'
+down_revision: Union[str, Sequence[str], None] = '0ea5625b4913'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint(op.f('orders_user_id_key'), 'orders', type_='unique')
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_unique_constraint(op.f('orders_user_id_key'), 'orders', ['user_id'], postgresql_nulls_not_distinct=False)
+    # ### end Alembic commands ###