def _ser_attempt(a: SendAttempt) -> dict:
    return {
        "id": a.id,
        "campaign_id": a.campaign_id,
        "campaign_recipient_id": a.campaign_recipient_id,
        "account_id": a.gmail_account_id,
        "attempt_number": a.attempt_number,
        "outcome": a.outcome,
        "error_class": a.error_class,
        "error_message": (a.error_message or "")[:300],
        "message_id": a.message_id,
        "provider_response": (a.provider_response or "")[:300],
        "created_at": a.created_at.isoformat() if a.created_at else None,
    }


@router.get("/list")
=== test_send out ===
125:                return {"ok": False, "error": "No OAuth token stored for this account",
137:        return {"ok": False, "stage": "temp_failed", "detail": str(e)[:400],
144:        return {"ok": True, "stage": "accepted", "detail": "Gmail accepted the message",
154:    return {"ok": False, "stage": "perm_failed", "detail": err[:400],
177:    return {"accounts": [{"id": a.id, "email": a.email,
186:    return {"templates": [{"id": t.id, "name": t.name} for t in rows]}
        return {"ok": True, "stage": "accepted", "detail": "Gmail accepted the message",
                "message_id": result.get("message_id"),
                "thread_id": result.get("thread_id"),
137:        return {"ok": False, "stage": "temp_failed", "detail": str(e)[:400],
143:                        {"to": str(payload.to_email), "message_id": result.get("message_id")})
144:        return {"ok": True, "stage": "accepted", "detail": "Gmail accepted the message",
145:                "message_id": result.get("message_id"),
148:                "provider_response": _clip(str(result.get("raw_response", ""))),
154:    return {"ok": False, "stage": "perm_failed", "detail": err[:400],
157:            "provider_response": _clip(str(result.get("raw_response", ""))),