"""add user display name

Revision ID: d9f3c6a1b7f0
Revises: c1f8d92b4e31
Create Date: 2026-04-21 18:20:00.000000
"""

from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision = "d9f3c6a1b7f0"
down_revision = "c1f8d92b4e31"
branch_labels = None
depends_on = None


def upgrade():
    with op.batch_alter_table("user", schema=None) as batch_op:
        batch_op.add_column(sa.Column("display_name", sa.String(length=120), nullable=True))

    op.execute('UPDATE user SET display_name = username WHERE display_name IS NULL')

    with op.batch_alter_table("user", schema=None) as batch_op:
        batch_op.alter_column("display_name", existing_type=sa.String(length=120), nullable=False)


def downgrade():
    with op.batch_alter_table("user", schema=None) as batch_op:
        batch_op.drop_column("display_name")