Prepare mobile de parser preview

alembic/versions/003_add_composite_indexes.py

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+# Индексы для масштабированной БД (20k+ записей)
+from typing import Sequence, Union
+
+from alembic import op
+
+revision: str = "003_add_composite_indexes"
+down_revision: Union[str, None] = "002_add_indexes"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # Partial index для активных машин IAAI (is_sold = FALSE)
+    # Ускоряет поиск при mark_sold операциях
+    op.execute(
+        "CREATE INDEX IF NOT EXISTS ix_iaai_cars_active_iaai "
+        "ON iaai_cars (origin_url) "
+        "WHERE is_sold = FALSE AND origin_id LIKE 'iaai:%'"
+    )
+
+    # Composite index для проверки дубликатов изображений
+    op.execute(
+        "CREATE INDEX IF NOT EXISTS ix_iaai_images_car_id_fullres "
+        "ON iaai_images (car_id, fullres_image)"
+    )
+
+    # Index для быстрого поиска existing машин по origin_url
+    op.execute(
+        "CREATE INDEX IF NOT EXISTS ix_iaai_cars_origin_url_id "
+        "ON iaai_cars (origin_url, origin_id)"
+    )
+
+
+def downgrade() -> None:
+    # Compatibility-only migration for shared production databases.
+    pass