34 lines
921 B
Python
34 lines
921 B
Python
"""add unique constraint on images(car_id, fullres_image)
|
|
|
|
Revision ID: 005
|
|
Revises: 004_widen_string_columns
|
|
Create Date: 2026-04-16
|
|
"""
|
|
from alembic import op
|
|
|
|
revision = "005_unique_images_constraint"
|
|
down_revision = "004_widen_string_columns"
|
|
branch_labels = None
|
|
depends_on = None
|
|
|
|
|
|
def upgrade() -> None:
|
|
# Удаляем дубли через CTE + ROW_NUMBER (быстрее чем NOT IN subquery)
|
|
op.execute("""
|
|
WITH dupes AS (
|
|
SELECT id,
|
|
ROW_NUMBER() OVER (PARTITION BY car_id, fullres_image ORDER BY id) AS rn
|
|
FROM images
|
|
)
|
|
DELETE FROM images WHERE id IN (SELECT id FROM dupes WHERE rn > 1)
|
|
""")
|
|
op.create_unique_constraint(
|
|
"uq_images_car_id_fullres",
|
|
"images",
|
|
["car_id", "fullres_image"],
|
|
)
|
|
|
|
|
|
def downgrade() -> None:
|
|
op.drop_constraint("uq_images_car_id_fullres", "images", type_="unique")
|