code: def upgrade():
      op.add_column(
          "query",
          sa.Column(
              "end_result_backend_time",
              sa.Numeric(precision=20, scale=6),
              nullable=True,
          ),
      )
  
imports: import sqlalchemy
  from alembic import op
label_desc: Use image node_id 1 for calling a global function with example usage: upgrade() without return types