UPGRADE FROM 2.3 to 2.4
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Configuration
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 * Setting the `host`, `port`, `user`, `password`, `path`, `dbname`, `unix_socket`
   or `memory` configuration options while the `url` one is set has been deprecated.
 * The `override_url` configuration option has been deprecated.

ConnectionFactory
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 * The `connection_override_options` parameter has been deprecated.