nodejs insert postgresql tables

I am trying insert random data(size must be 250K) to the table. here is my table schema DDL: CREATE TABLE entries (entryID serial PRIMARY KEY NOT NULL,content bytea);

Here is my code:

'use strict';

var pg  = require('pg');
var randomBytes = require('randombytes');

var pool = new pg.Pool({
 host     : 'xxx',
 user     : 'postgres',
 password : 'xxxx',
 database : 'mydb',
 max:20,
 idleTimeoutMillis: 3000,
});

async function run(){

 for (let i=0; i<100000; i++){

 await new Promise(done => setTimeout(done, 100));
 await pool.connect(function (error, connection) {
   if (error) throw error;
   connection.query('insert into entries(content) values($1)', [randomBytes(8)+Buffer.alloc(249992,1)], function (error, results, fields) {
     if (error) throw error;
     connection.release();
     console.log("Current row "+ i + "!");
   });
 });
}
}
run();

everytime i run the code , after server rounds, it errored as infor : error: invalid byte sequence for encoding "UTF8": 0x00 or error: invalid input syntax for type bytea

here is the env info: psql (13.11 (Debian 13.11-0+deb11u1), server 14.7) SSL connection (protocol: TLSv1.3, cipher: TLS_AES_256_GCM_SHA384, bits: 256, compression: off)

i run the similar code in mysql(with mediumblob ) is fine. how can i run it in postgresql