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Add eu_touched field to wbc_entity_usage.

Authored by daniel.

Description

Add eu_touched field to wbc_entity_usage.

The eu_touched field allows us to track which timestamp in page.page_touched
the row in wbc_entity_usage refers to. That allows us to detect outdated
entries.

NOTE: this patch only defines the database table, it does not add code to make use of it.

DEPLOY: apply client/sql/entity_usage-add-touched.sql

Bug: T93057
Change-Id: Ib9afa69b6d37c4e856121d82364420fdae4b357d

Details