There are several messages from producer that I receive and I need to store them in to the stream but I don't want to do it manually from ksqldb console and need to handle those insertions via programming (Python/Java). Could anybody show me a sample code or any reference? Thanks!
you can use the REST APIs or the Java client to interact with ksqlDB. Here's the doc for Java client with code snippet for insert: https://docs.ksqldb.io/en/latest/developer-guide/ksqldb-clients/java-client/#stream-inserts.