Out of PHP memory when running aggregator_post_update_add_item_uuids()

Issue information

From user: it-cru

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Problem/Motivation

I'm running a website with over 60k aggregator item entities and during testing the update from 1.0.2 to 1.1.0 the aggregator_post_update_add_item_uuids() runs into PHP out of memory issues.

I'm using a hook_ENTITY_TYPE_presave() for aggregator_item entity which use additional memory during update process, but in general this update should be fail safe with high number of aggregator_item entities.

Steps to reproduce

Proposed resolution

Use $sandbox batch processing in aggregator_post_update_add_item_uuids() to create UUIDs for all existing aggregator item entities.

Remaining tasks

User interface changes

API changes

Data model changes