Fix UNIQUE constraint failed: auth.name in callback createAuth()

mods/PLAYER/mcl_anticheat/init.lua

@@ -1,3 +1,6 @@
+local modpath = minetest.get_modpath(minetest.get_current_modname())
+dofile(modpath .. "/ratelimit.lua")
+
 local enable_anticheat = true
 local kick_cheaters = false
 local kick_threshold = 10

mods/PLAYER/mcl_anticheat/ratelimit.lua

@@ -0,0 +1,21 @@
+-- by LoneWolfHT
+-- https://github.com/minetest/minetest/issues/12220#issuecomment-1108789409
+
+local ratelimit = {}
+local after = minetest.after
+local LIMIT = 2
+
+local function remove_entry(ip)
+	ratelimit[ip] = nil
+end
+
+minetest.register_on_mods_loaded(function()
+	table.insert(core.registered_on_prejoinplayers, 1, function(player, ip)
+		if ratelimit[ip] then
+			return "You are joining too fast, please try again"
+		else
+			ratelimit[ip] = true
+			after(LIMIT, remove_entry, ip)
+		end
+	end)
+end)