"""add terms table and term_id to tune_by_instrument

Revision ID: b1c2d3e4f5a6
Revises: f1a2b3c4d5e6
Create Date: 2026-06-09
"""
from alembic import op
import sqlalchemy as sa

revision = "b1c2d3e4f5a6"
down_revision = "f1a2b3c4d5e6"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.create_table(
        "terms",
        sa.Column("id",   sa.Integer(), primary_key=True, autoincrement=True),
        sa.Column("name", sa.String(),  nullable=False, unique=True),
    )
    op.add_column(
        "tune_by_instrument",
        sa.Column(
            "term_id",
            sa.Integer(),
            sa.ForeignKey("terms.id", ondelete="SET NULL"),
            nullable=True,
        ),
    )


def downgrade() -> None:
    op.drop_column("tune_by_instrument", "term_id")
    op.drop_table("terms")