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- GlobalExceptionHandler maps uq_journey_items_geschichte_position constraint violation to HTTP 409 JOURNEY_ITEM_POSITION_CONFLICT - JourneyItemService.reorder() rejects duplicate IDs before set-equality check to prevent silent position overwrite - JourneyItemRepository removes orphaned findAllByGeschichteId method - GeschichteView removes stale com.fasterxml.jackson import - Tests: add appendItem_returns409_on_position_conflict (controller), reorder_returns400_when_itemIds_contain_duplicates (service) - Fix JourneyItemIntegrationTest compilation after repository cleanup - db-orm.puml annotates journey_items position with CHECK + UNIQUE DEFERRABLE Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>