backend/migrations/versions/0001_init.py

from alembic import op
import sqlalchemy as sa

revision = '0001_init'
down_revision = None
branch_labels = None
depends_on = None

def upgrade():
    op.create_table(
        'users',
        sa.Column('id', sa.Integer(), primary_key=True),
        sa.Column('email', sa.String(255), nullable=False, unique=True),
        sa.Column('password_hash', sa.String(255), nullable=False),
        sa.Column('created_at', sa.DateTime(), nullable=True),
    )
    op.create_table(
        'api_keys',
        sa.Column('id', sa.Integer(), primary_key=True),
        sa.Column('key', sa.String(255), nullable=False, unique=True),
        sa.Column('revoked', sa.Boolean(), default=False),
        sa.Column('created_at', sa.DateTime(), nullable=True),
        sa.Column('user_id', sa.Integer(), sa.ForeignKey('users.id', ondelete='CASCADE'))
    )
    op.create_table(
        'chat_history',
        sa.Column('id', sa.Integer(), primary_key=True),
        sa.Column('role', sa.String(20)),
        sa.Column('content', sa.Text(), nullable=False),
        sa.Column('created_at', sa.DateTime(), nullable=True),
        sa.Column('user_id', sa.Integer(), sa.ForeignKey('users.id', ondelete='CASCADE'))
    )

def downgrade():
    op.drop_table('chat_history')
    op.drop_table('api_keys')
    op.drop_table('users')