I'm trying to create a source with postgres-cdc in RisingWave, but I'm encountering errors related to primary key constraints and syntax. Here's what I've tried:

CREATE SOURCE IF NOT EXISTS table_metadata_source (
    handle character varying,
    key_type text,
    value_type text,
    inserted_at timestamp without time zone,
) WITH (
    connector = 'postgres-cdc',
    hostname = '*****',
    port = '5432',
    username = '*****',
    password = '*****',
    database.name = 'postgres',
    schema.name = 'public',
    table.name = 'table_metadatas'
);

This resulted in an error stating that a primary key must be specified. After adding a primary key, I received another error indicating that the source does not support the PRIMARY KEY constraint and suggested using CREATE TABLE instead. How should I proceed to create a source with postgres-cdc correctly?