-- GET /api/training-units: Keyset über (planned_date, planned_time_start NULLS LAST per Sort, id)
-- Ersetzt den reinen Datum/Uhrzeit-Teilindex 059 durch zwei Richtungen mit Tie-Break id.

DROP INDEX IF EXISTS idx_training_units_scheduled_order;

CREATE INDEX IF NOT EXISTS idx_training_units_list_keyset_desc
ON training_units (
  planned_date DESC,
  (planned_time_start IS NULL) ASC,
  planned_time_start DESC NULLS LAST,
  id DESC
)
WHERE framework_slot_id IS NULL;

CREATE INDEX IF NOT EXISTS idx_training_units_list_keyset_asc
ON training_units (
  planned_date ASC,
  (planned_time_start IS NULL) ASC,
  planned_time_start ASC NULLS LAST,
  id ASC
)
WHERE framework_slot_id IS NULL;