Should not reach here: undefined

[caramboleyo-no2fa]

I am using stream to move a big data set, but it seems there is a cap of ~460 iterations that causes an error i dont understand.

This is my code:

let i = 0;
const stream = connection.query('SELECT * FROM schedules ORDER BY id ASC').stream();
stream.on('data', result => {
	stream.pause();
	db.collection('packages').deleteOne({ id: result.id }).then(() => {
		db.collection('packages').insertOne(result).then(() => {
			i++;
			if (i % 1000 === 0) {
				console.log('Processed', i);
			}
			stream.resume();
		});
	});
});
stream.on('end', () => {
	connection.end();
	mongoClient.close();
	console.log('Finished streaming', i);
});

      at readLengthCodedNumberExt (/home/bun/app/node_modules/mysql2/lib/packets/packet.js:231:13)
      at readLengthCodedString (/home/bun/app/node_modules/mysql2/lib/packets/packet.js:381:22)
      at next (32:68)
      at row (/home/bun/app/node_modules/mysql2/lib/commands/query.js:242:29)
      at execute (/home/bun/app/node_modules/mysql2/lib/commands/command.js:45:22)
      at handlePacket (/home/bun/app/node_modules/mysql2/lib/connection.js:481:34)
      at /home/bun/app/node_modules/mysql2/lib/connection.js:97:12
      at executePayload (/home/bun/app/node_modules/mysql2/lib/packet_parser.js:139:14)
      at /home/bun/app/node_modules/mysql2/lib/connection.js:104:25
227 |       res = resNumber.toString() === resString ? resNumber : resString;
228 |       return bigNumberStrings ? resString : res;
229 |     }
230 |     // eslint-disable-next-line no-console
231 |     console.trace();
232 |     throw new Error(`Should not reach here: ${tag}`);
                ^
error: Should not reach here: undefined
      at readLengthCodedNumberExt (/home/bun/app/node_modules/mysql2/lib/packets/packet.js:232:11)
      at readLengthCodedString (/home/bun/app/node_modules/mysql2/lib/packets/packet.js:381:22)
      at next (32:68)
      at row (/home/bun/app/node_modules/mysql2/lib/commands/query.js:242:29)
      at execute (/home/bun/app/node_modules/mysql2/lib/commands/command.js:45:22)
      at handlePacket (/home/bun/app/node_modules/mysql2/lib/connection.js:481:34)
      at /home/bun/app/node_modules/mysql2/lib/connection.js:97:12
      at executePayload (/home/bun/app/node_modules/mysql2/lib/packet_parser.js:139:14)
      at /home/bun/app/node_modules/mysql2/lib/connection.js:104:25
      at emit (node:events:183:48)

if i use async/await instead of thenables i have the same result, only when i dont do both it runs through, but then 3mio db operations stuck up in memory and make dev ops kill it.

all i want is to do this in the background a little slower.