Crud webhook amount (#474)

* get_standalone_payment selects only incoming tx

lnbits/core/crud.py

@@ -30,7 +30,8 @@ async def get_account(
     user_id: str, conn: Optional[Connection] = None
 ) -> Optional[User]:
     row = await (conn or db).fetchone(
-        "SELECT id, email, pass as password FROM accounts WHERE id = ?", (user_id,)
+        "SELECT id, email, pass as password FROM accounts WHERE id = ?", (
+            user_id,)
     )
 
     return User(**row) if row else None
@@ -184,7 +185,7 @@ async def get_standalone_payment(
         """
         SELECT *
         FROM apipayments
-        WHERE checking_id = ? OR hash = ?
+        WHERE (checking_id = ? OR hash = ?) AND amount > 0 -- only the incoming payment
         LIMIT 1
         """,
         (checking_id_or_hash, checking_id_or_hash),
@@ -304,7 +305,8 @@ async def delete_expired_invoices(conn: Optional[Connection] = None,) -> None:
         except:
             continue
 
-        expiration_date = datetime.datetime.fromtimestamp(invoice.date + invoice.expiry)
+        expiration_date = datetime.datetime.fromtimestamp(
+            invoice.date + invoice.expiry)
         if expiration_date > datetime.datetime.utcnow():
             continue