Configure the maximum number of seconds a connection can persist when connecting to Cloud SQL for PostgreSQL by using the HikariCP JDBC connection. pool library.
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// maxLifetime is the maximum possible lifetime of a connection in the pool. Connections that // live longer than this many milliseconds will be closed and reestablished between uses. This // value should be several minutes shorter than the database's timeout value to avoid unexpected // terminations. config.setMaxLifetime(1800000); // 30 minutes