Migration done

alembic/versions/2025_11_19_1457-08fe946414d8_add_hashed_customer_id_to_reservations_.py

@@ -0,0 +1,65 @@
+"""add hashed_customer_id to reservations with cascade delete
+
+Revision ID: 08fe946414d8
+Revises: 70b2579d1d96
+Create Date: 2025-11-19 14:57:27.178924
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '08fe946414d8'
+down_revision: Union[str, Sequence[str], None] = '70b2579d1d96'
+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.alter_column('hashed_customers', 'customer_id',
+               existing_type=sa.INTEGER(),
+               nullable=True)
+    op.drop_constraint(op.f('hashed_customers_customer_id_fkey'), 'hashed_customers', type_='foreignkey')
+    op.create_foreign_key(None, 'hashed_customers', 'customers', ['customer_id'], ['id'], ondelete='SET NULL')
+    op.drop_constraint(op.f('reservations_customer_id_fkey'), 'reservations', type_='foreignkey')
+    op.create_foreign_key(None, 'reservations', 'customers', ['customer_id'], ['id'], ondelete='SET NULL')
+
+    # Add hashed_customer_id column to reservations with cascade delete
+    op.add_column('reservations', sa.Column('hashed_customer_id', sa.Integer(), nullable=True))
+    op.create_index(op.f('ix_reservations_hashed_customer_id'), 'reservations', ['hashed_customer_id'], unique=False)
+    op.create_foreign_key(None, 'reservations', 'hashed_customers', ['hashed_customer_id'], ['id'], ondelete='CASCADE')
+    # ### end Alembic commands ###
+
+    # Data migration: Populate hashed_customer_id from customer relationship
+    connection = op.get_bind()
+    update_stmt = sa.text("""
+        UPDATE reservations r
+        SET hashed_customer_id = hc.id
+        FROM hashed_customers hc
+        WHERE r.customer_id = hc.customer_id
+          AND hc.customer_id IS NOT NULL
+    """)
+    connection.execute(update_stmt)
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    # Drop the hashed_customer_id column and its constraints
+    op.drop_constraint(None, 'reservations', type_='foreignkey')
+    op.drop_index(op.f('ix_reservations_hashed_customer_id'), table_name='reservations')
+    op.drop_column('reservations', 'hashed_customer_id')
+
+    op.drop_constraint(None, 'reservations', type_='foreignkey')
+    op.create_foreign_key(op.f('reservations_customer_id_fkey'), 'reservations', 'customers', ['customer_id'], ['id'])
+    op.drop_constraint(None, 'hashed_customers', type_='foreignkey')
+    op.create_foreign_key(op.f('hashed_customers_customer_id_fkey'), 'hashed_customers', 'customers', ['customer_id'], ['id'])
+    op.alter_column('hashed_customers', 'customer_id',
+               existing_type=sa.INTEGER(),
+               nullable=False)
+    # ### end Alembic commands ###