working on new history code

persistence.lua

@@ -8,9 +8,6 @@ aux_database = {}
 function public.on_load()
     private.perform_migration(aux_database)
     aux_database.version = DATABASE_VERSION
-    Aux.control.as_soon_as(function() return UnitFactionGroup('player') end, function()
-        public.load_snapshot().compact()
-    end)
 end
 
 function private.perform_migration()
@@ -29,13 +26,6 @@ function public.load_dataset()
     return aux_database[dataset_key]
 end
 
-function public.load_snapshot()
-    local dataset = public.load_dataset()
-    dataset.snapshot = dataset.snapshot or {}
-    local snapshot = private.snapshot(dataset.snapshot)
-    return snapshot
-end
-
 function public.serialize(data, separator, compactor)
     local data_string = ''
     local i = 1
@@ -53,7 +43,7 @@ function public.serialize(data, separator, compactor)
 end
 
 function public.deserialize(data_string, separator, compactor)
-    if data_string == '' then
+    if not data_string or data_string == '' then
         return {}
     end
 
@@ -82,47 +72,4 @@ function public.deserialize(data_string, separator, compactor)
             return data
         end
     end
-end
-
-function private.snapshot(data)
-    local self = {}
-
-    function self.add(signature, duration)
-        local HOUR = 60 * 60 * 60
-        local seconds
-        if duration == 1 then
-            seconds = HOUR / 2
-        elseif duration == 2 then
-            seconds = HOUR * 2
-        elseif duration == 3 then
-            seconds = HOUR * 8
-        elseif duration == 4 then
-            seconds = HOUR * 24
-        end
-        data[signature] = time() + seconds
-    end
-
-    function self.contains(signature)
-        return data[signature] ~= nil and data[signature] >= time()
-    end
-
-    function self.compact()
-        for signature, expiration in pairs(data) do
-            if expiration < time() then
-                data[signature] = nil
-            end
-        end
-    end
-
-    function self.signatures()
-        local signatures = {}
-        for signature, _ in pairs(data) do
-            if data[signature] >= time() then
-                tinsert(signatures, signature)
-            end
-        end
-        return signatures
-    end
-
-    return self
-end
+end