Check out restSQL . This is an open source layer, ultra lightweight emphasis. This is sufficient for basic CRUD and some basic filtering support.
It is built in support for MySQL and PostgreSQL, but can be decrypted for other RDBMS. It works in standard JEE containers, for example. Tomcat, or comes as a Docker container.
You can take it for rotation using an isolated instance and examine the documents at http://restsql.org .
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