"""widen quotes.symbol to 128 chars to fit Eurostat / ONS path identifiers

Revision ID: 0005
Revises: 0004
Create Date: 2026-05-15
"""
from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op


revision: str = "0005"
down_revision: Union[str, None] = "0004"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    # batch_alter_table wraps the ALTER in a copy-and-rename dance for
    # SQLite (which doesn't support ALTER COLUMN TYPE) while remaining a
    # plain ALTER on MariaDB / Postgres. Required for `alembic upgrade
    # head` to work against a fresh SQLite database during local tooling
    # or test bootstrap.
    with op.batch_alter_table("quotes") as bop:
        bop.alter_column(
            "symbol",
            existing_type=sa.String(64),
            type_=sa.String(128),
            existing_nullable=False,
        )


def downgrade() -> None:
    with op.batch_alter_table("quotes") as bop:
        bop.alter_column(
            "symbol",
            existing_type=sa.String(128),
            type_=sa.String(64),
            existing_nullable=False,
        )