"""add performance indexes

Revision ID: add_perf_indexes
Revises: add_payment_transactions_table
Create Date: 2026-06-11

Add indexes for common query patterns to improve performance.
"""
from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision = 'add_perf_indexes'
down_revision = 'add_payment_transactions_table'
branch_labels = None
depends_on = None


def upgrade() -> None:
    # Customer indexes
    op.create_index('ix_customer_user_status', 'customers', ['user_id', 'status'])
    op.create_index('ix_customer_user_last_contact', 'customers', ['user_id', 'last_contact_at'])
    
    # Payment transaction indexes
    op.create_index('ix_payment_user_created', 'payment_transactions', ['user_id', 'created_at'])
    
    # Followup log indexes
    op.create_index('ix_followup_user_customer', 'followup_logs', ['user_id', 'customer_id'])
    
    # Notification indexes
    op.create_index('ix_notification_user_read', 'notifications', ['user_id', 'is_read'])


def downgrade() -> None:
    # Remove indexes
    op.drop_index('ix_notification_user_read', 'notifications')
    op.drop_index('ix_followup_user_customer', 'followup_logs')
    op.drop_index('ix_payment_user_created', 'payment_transactions')
    op.drop_index('ix_customer_user_last_contact', 'customers')
    op.drop_index('ix_customer_user_status', 'customers')