Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2326949 by plach, effulgentsia: Move entity-type-specific schema information from the storage class to a schema handler.

Issue #2183231 by tstoeckler, plach, jessebeach, fago, Berdir, xjm, mauzeh: Make ContentEntityDatabaseStorage generate static database schemas for content entities.

Issue #1957312 by ParisLiakos, peximo, Désiré: Use the entity storage controller in aggregator module.

Issue #2028039 by ParisLiakos, jsbalsera, undertext, mcrittenden, xeniak, amateescu: Expand ItemInterface (aggregator.module) with methods.

Issue #1847002 by tim.plunkett, effulgentsia, msonnabaum: Move entity type classes from Drupal$provider\Plugin\Core\Entity to Drupal$provider\Entity.

Issue #2043581 by larowlan, kim.pepper: Move aggregator_load_feed_items() to the ItemStorageController, retain procedural wrapper.

Issue #1893772 by chx, fubhy, slashrsm: Move entity-type specific storage logic into entity classes.

Issue #293318 by alex_b, Berdir, rootatwc, Aron Novak, mustafau, akahn: Convert Aggregator feeds into entities.