Change record status: 
Project: 
Introduced in branch: 
10.3.x
Introduced in version: 
10.3.0
Description: 

The sessions table is now defined in Drupal\Core\Session\SessionHandler instead of the sessions table. This should not require action by other sites or modules but will have the following effects:

1. The session table definition will no longer be available from system_schema().

2. Sites that are installed with an alternative session handler like Redis will no longer have the session table created at all.

Impacts: 
Site builders, administrators, editors
Module developers