This commit improves JDBC configuration by introducing `@SpringSessionDataSource` qualifier for explicitly declaring a `DataSource` to be used by Spring Session. This is in particular useful in scenarios with multiple `DataSource` beans present in the application context.
As a consequence, JDBC configuration is simplified and no longer registers a Spring Session specific `JdbcTemplate` bean.
Closes gh-863
This commit improves session cleanup handling in `JdbcOperationsSessionRepository#cleanUpExpiredSessions` by optimizing the used SQL statement. This is done by calculating the session expiry time when persisting the session, which in turn allows the cleanup SQL statement to be more index-friendly.
Closes gh-847
