"""add unique constraint to user.username

Revision ID: a1b2c3d4e5f6
Revises: 4e8d78ff6e9e
Create Date: 2026-04-07 15:00:00.000000

"""

from typing import Sequence, Union

from alembic import op

revision: str = "a1b2c3d4e5f6"
down_revision: Union[str, Sequence[str], None] = "4e8d78ff6e9e"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_unique_constraint("uq_user_username", "user", ["username"])


def downgrade() -> None:
    op.drop_constraint("uq_user_username", "user", type_="unique")