Need suggestions- We are syncing sales cloud and service cloud data to another database via middleware for reporting and BI purpose. Every time  we do any changes on these objects, create/delete/update any fields , we have to change the middleware and provide the exact definition of objects/fields.

Is there any way that middleware can get the schema and data and then handle database sync by its own. for example - xml or JSON files have schema as well as data. end system parse the schema and collect the data. We want such robust connection while connecting with Salesforce. We have to modify SOQL query everytime when we do changes on Salesforce side.