not sure this will work... but would be nicer to have proper escaping.

```javascript
db.query("INSERT INTO job_snapshots (job_id, data, process_at) " +
  "VALUES ($1, $2, NOW() + INTERVAL '$3::int milliseconds');",
  [jobId, data, process_at], callback);
```

if that doesn't work, at the very least you should probably `parseInt(processIn, 10)`