concept
CH column metadata: archives_i90.startup_gas.energy
Always 0 by source-shape design (CH NOT NULL → 0). Don't multiply — `price` is already the total absolute cost.
# `archives_i90.startup_gas.energy`
Always 0 by source-shape design (CH NOT NULL → 0). Don't multiply — `price` is already the total absolute cost.
- **common_pitfalls**:
- energy=0 is structural, not 'no data' — always read price directly