Handle Larger Datasets with Increased Apex Heap Limits

The Apex heap limit rises from 6 MB to 10 MB for synchronous transactions and from 12 MB to 25 MB for asynchronous transactions, enabled automatically on the Winter '27 schedule. Confirm the active limit with Limits.getLimitHeapSize(). To keep deploying Winter '27 sandbox work to Summer '26 production, temporarily set 'Enforce the Summer '26 Apex heap limit' in Apex Settings in a nonproduction org; that setting exists only in Winter '27 and the higher limits are enforced globally in Spring '27.