"""widen VEP text columns

VEP joins multiple consequences with "&" and co-located ClinVar significances with ",", which
overflowed VARCHAR(120) and aborted the whole load transaction.

Revision ID: 5f2c8e1b9d04
Revises: a3e9ead256a5
Create Date: 2026-09-11 18:00:00.000000

"""
from collections.abc import Sequence

import sqlalchemy as sa
from alembic import op

revision: str = '5f2c8e1b9d04'
down_revision: str | None = 'a3e9ead256a5'
branch_labels: str | Sequence[str] | None = None
depends_on: str | Sequence[str] | None = None

COLUMNS = ('consequence', 'clinvar_sig')


def upgrade() -> None:
    for column in COLUMNS:
        op.alter_column('variants', column, type_=sa.Text(), existing_type=sa.String(length=120))


def downgrade() -> None:
    for column in COLUMNS:
        op.alter_column(
            'variants', column, type_=sa.String(length=120), existing_type=sa.Text(),
            postgresql_using=f'left({column}, 120)',
        )