cd /home/def/otb_billing/backend || exit 1

STAMP="$(date +%Y%m%d-%H%M%S)"
cp app.py "app.py.retry-email.${STAMP}.bak"

python3 <<'PY'
from pathlib import Path

p = Path("app.py")
text = p.read_text()

old = '''        send_configured_email(
            to_email=invoice_email_row.get("email"),
            subject=subject,
            body=body,
            attachments=attachments,
            email_type="payment_received",
            invoice_id=invoice_id
        )
        return True
    except Exception:
        return False
'''

new = '''        import time

        for attempt in range(3):
            try:
                send_configured_email(
                    to_email=invoice_email_row.get("email"),
                    subject=subject,
                    body=body,
                    attachments=attachments,
                    email_type="payment_received",
                    invoice_id=invoice_id
                )
                return True
            except Exception as e:
                print(f"[email retry] invoice_id={invoice_id} attempt={attempt+1} error={type(e).__name__}: {e}")
                if attempt < 2:
                    time.sleep(2)

        print(f"[send_payment_received_email] FAILED after retries invoice_id={invoice_id}")
        return False
    except Exception:
        return False
'''

if old not in text:
    raise SystemExit("FAILED: exact helper send block not found")

text = text.replace(old, new, 1)
p.write_text(text)
print("OK: retry logic added to helper")
PY

python3 -m py_compile app.py && echo "PY_COMPILE_OK" || echo "PY_COMPILE_FAILED"
sudo systemctl restart otb_billing
sudo systemctl status otb_billing --no-pager -l