anchor.diff:  * `tags` including `postgresql`
   * `label` beginning with the `postgresql` tag
   * `uri` or `uris` using the scheme `postgres`
  -* `jdbcUrl` field in `credentials` using the scheme `postgres`
  +* `jdbcUrl` field in `credentials` using the subprotocol `postgres` in the JDBC URL
   * `postgresUri`, `postgresuri`, `postgresUrl`, or `postgresurl` fields in `credentials`
   
   ==== RabbitMQ
  
positive.code: * `tags` including `sqldb`, `dashDB`, or `db2`
  * `label` beginning with the `sqldb`, `dashDB`, or `db2` tags
  * `uri` or `uris` using the scheme `db2`
  * `jdbcUrl` field in `credentials` using the scheme `db2`
  * `db2Uri`, `db2uri`, `db2Url`, or `db2url` fields in `credentials`
  
  ==== MongoDB
  
negative.code: * `tags` including `mysql`
  * `label` beginning with the `mysql` tag
  * `uri` or `uris` using the scheme `mysql`
  * `jdbcUrl` field in `credentials` using the subprotocol `mysql` in the JDBC URL
  * `mysqlUri`, `mysqluri`, `mysqlUrl`, or `mysqlurl` fields in `credentials`
  
  ==== Oracle
  