INFLEXIBLE_CONSUMPTION
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Power (or energy) sensors representing loads that are relevant, but not flexible in the timing of their demand.
For example, a sensor recording the power of a base load that is connected behind the main meter, and whose consumption falls under the same contract as the flexible device(s) being scheduled.
Their power demand cannot be adjusted but still matters for finding the best schedule for other devices.

The sign convention is determined by the key name: positive values denote consumption.
Sensors that explicitly record consumption as negative values (``consumption_is_positive`` attribute set to false) are rejected here; list them under ``inflexible-production`` instead.

Each entry is a sensor reference, optionally with source filters. In the flex-context this is a list of such references (site-level base load); in a flex-model entry it is a single reference, so that an inflexible device modelled as its own asset can join a ``group`` like any other member.