billing: improve playlimit calculation

core/allnet.py

@@ -711,7 +711,6 @@ class BillingServlet:
             "messages": []
         }
         playhist = "000000/0:000000/0:000000/0"
-        total_playcount = req.playcnt
         
         if machine is not None:
             if self.config.allnet.save_billing:
@@ -732,8 +731,6 @@ class BillingServlet:
 
                 plays = await self.data.arcade.billing_get_playcount_3mo(machine['id'], req.gameid)
                 if plays:
-                    total_playcount = sum(p['playct'] for p in plays)
-
                     playhist = ":".join(
                         f"{p['year']:04d}{p['month']:02d}/{p['playct']}" 
                         for p in reversed(plays)
@@ -820,7 +817,7 @@ class BillingServlet:
             return PlainTextResponse("result=6&waittime=0&linelimit=20\r\n")
     
         playlimit = req.playlimit
-        while total_playcount > playlimit:
+        while req.playcnt >= playlimit - req.nearfull:
             playlimit += 1024
 
         nearfull = req.nearfull | (req.billingtype.value << 16)