Tweak the whowas config defaults

- Decrease the default number of nick groups.
- Increase the days to keep records for.
- Enable update on nick change by default.
- Remove the upper bounds on the fields.

docs/conf/inspircd.example.conf

@@ -940,24 +940,25 @@
 #                                                                     #
 <whowas
         # groupsize: Maximum entries per nick shown when performing
-        # a /WHOWAS <nick>.
+        # a /WHOWAS <nick>. Defaults to 10.
         groupsize="10"
 
         # maxgroups: Maximum number of nickgroups that can be added to
         # the list so that /WHOWAS does not use a lot of resources on
-        # large networks.
-        maxgroups="100000"
+        # large networks. Defaults to 10000.
+        maxgroups="10000"
 
         # maxkeep: Maximum time a nick is kept in the whowas list
         # before being pruned. Time may be specified in seconds,
         # or in the following format: 1y2w3d4h5m6s. Minimum is
-        # 1 hour.
-        maxkeep="3d"
+        # 1 hour. Defaults to 7 days.
+        maxkeep="7d"
 
         # nickupdate: Whether to update the WHOWAS database on nick
         # change as well as quit. This can significantly increase the
-        # memory usage of your IRC server.
-        nickupdate="no">
+        # memory usage of your IRC server so it is not recommended
+        # for large networks. Defaults to yes.
+        nickupdate="yes">
 
 #-#-#-#-#-#-#-#-#-#-#-#-#-#-  BAN OPTIONS  -#-#-#-#-#-#-#-#-#-#-#-#-#-#
 #                                                                     #

src/coremods/core_whowas.cpp

@@ -470,12 +470,12 @@ public:
 	void ReadConfig(ConfigStatus& status) override
 	{
 		const auto& tag = ServerInstance->Config->ConfValue("whowas");
-		unsigned int NewGroupSize = tag->getNum<unsigned int>("groupsize", 10, 0, 10000);
-		unsigned int NewMaxGroups = tag->getNum<unsigned int>("maxgroups", 10240, 0, 1000000);
-		unsigned int NewMaxKeep = static_cast<unsigned int>(tag->getDuration("maxkeep", 3600, 3600));
-		nickupdate = tag->getBool("nickupdate");
+		const auto groupsize = tag->getNum<unsigned int>("groupsize", 10);
+		const auto maxgroups = tag->getNum<unsigned int>("maxgroups", 10000);
+		const auto maxkeep = static_cast<unsigned int>(tag->getDuration("maxkeep", 7*24*60*60, 60*60));
+		nickupdate = tag->getBool("nickupdate", true);
 
-		cmd.manager.UpdateConfig(NewGroupSize, NewMaxGroups, NewMaxKeep);
+		cmd.manager.UpdateConfig(groupsize, maxgroups, maxkeep);
 	}
 };