Validate PostgreSQL ClickPipe inputs

README.md

@@ -810,6 +810,12 @@ clickhousectl cloud clickpipe create bigquery <service-id> \
   --table-mapping "dataset.table:target_table"
 ```
 
+PostgreSQL ClickPipes require one or more complete
+`--table-mapping schema.table:target_table` values. Ports must be in
+`1..=65535`. `--auth IAM_ROLE` requires `--iam-role`; the CLI rejects
+`--iam-role` with basic auth rather than silently ignoring it.
+`--replication-slot-name` is valid only with `--replication-mode cdc_only`.
+
 Use `clickhousectl cloud clickpipe create <source> --help` for the full list of options per source type.
 
 #### Discovering a source schema (beta)

crates/clickhousectl/src/cloud/cli.rs

@@ -57,6 +57,13 @@ impl CloudArgs {
                 }
             )
     }
+
+    pub fn postgres_clickpipe_validation_error(&self) -> Option<String> {
+        let CloudCommands::ClickPipe { command } = &self.command else {
+            return None;
+        };
+        command.postgres_create_validation_error()
+    }
 }
 
 #[derive(Subcommand)]