"""add_performance_indexes

Revision ID: 7f8e9d2a1b3c
Revises: a1b2c3d4e5f6
Create Date: 2025-11-19 19:14:00.000000

"""

from alembic import op

# revision identifiers, used by Alembic.
revision = "7f8e9d2a1b3c"
down_revision = "a1b2c3d4e5f6"
branch_labels = None
depends_on = None


def upgrade():
    # Add indexes for performance optimization
    # Items table indexes
    op.create_index("ix_items_last_checked", "items", ["last_checked"])
    op.create_index("ix_items_is_active", "items", ["is_active"])
    # Note: url already has an index from the model definition

    # Composite index for common query pattern (active items due for refresh)
    op.create_index("ix_items_active_last_checked", "items", ["is_active", "last_checked"])

    # Price history indexes for time-series queries
    op.create_index("ix_price_history_timestamp", "price_history", ["timestamp"])
    op.create_index("ix_price_history_item_timestamp", "price_history", ["item_id", "timestamp"])


def downgrade():
    # Remove indexes in reverse order
    op.drop_index("ix_price_history_item_timestamp", table_name="price_history")
    op.drop_index("ix_price_history_timestamp", table_name="price_history")
    op.drop_index("ix_items_active_last_checked", table_name="items")
    op.drop_index("ix_items_is_active", table_name="items")
    op.drop_index("ix_items_last_checked", table_name="items")