had to do this because i managed to import /most/ of these, but not /all/
log says
2024/09/05 01:25:59 "POST http://127.0.0.1:5106/query HTTP/1.0" from 127.0.0.1 - 200 40B in 19.380792ms
2024/09/05 01:25:59 Error importing message: pq: invalid byte sequence for encoding "UTF8": 0xe4 0xf6 0xfc
2024/09/05 01:25:59 Attempt 1/1 failed (panic: pq: Could not complete operation in a failed transaction), retrying in 2m0s
and log.Printf("envelope=%q", hex.EncodeToString([]byte(envelope.String()))) says that the envelope itself has raw ISO-8859-1 äöüß, instead of =AF escaping them. so yeah that's a sane take