FlexMeasures / flexmeasures / 28922549990

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Add smarter defaults for commodity contexts

A commodities-list entry that omits some or all grid-connection
fields (consumption-price, production-price, site-consumption-
capacity, site-production-capacity, site-power-capacity) previously
either failed (a missing consumption-price crashes the scheduler) or
left ambiguous, error-prone combinations to fill in by hand. Add
CommodityFlexContextSchema.fill_grid_connection_defaults, a post-load
step that derives sensible defaults from which of those five fields
were explicitly given:

- none given: no grid connection (both site capacities default to 0,
  as soft constraints; site-power-capacity stays unlimited)
- only a price given: assume a grid connection in that direction
  (unlimited capacity there), 0 capacity in the other direction
- only a capacity given: 0 price in that direction, and the other
  direction defaults to a 0 capacity (and price)
- only site-power-capacity given: a hard constraint at that capacity
  for both directions, with 0 prices

Combinations of explicitly given fields apply the same rules per
direction independently. A 0 capacity filled in by this method is
enforced as a soft constraint (a default breach price is filled in
too), not a hard, potentially infeasible, one; explicit hard
constraints (e.g. via site-power-capacity alone) get no breach price.

Signed-off-by: F.N. Claessen <claessen@seita.nl>

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