code: def upgrade():
      op.create_table(
          "agents",
          sa.Column("id", sa.Integer(), nullable=False),
          sa.Column("company_id", sa.Integer(), nullable=True),
          sa.Column("user_class", sa.Integer(), nullable=True),
          sa.Column("name", sa.String(), nullable=False),
          sa.Column("project_id", sa.Integer(), nullable=False),
          sa.Column("model_name", sa.String(), nullable=False),
          sa.Column("params", sa.JSON(), nullable=True),
          sa.Column("updated_at", sa.DateTime(), nullable=True),
          sa.Column("created_at", sa.DateTime(), nullable=True),
          sa.PrimaryKeyConstraint("id"),
      )
  
imports: from alembic import op
  import sqlalchemy
label_desc: Use image node_id 1 for calling a global function with example usage: upgrade() without return types