diff --git a/.gitignore b/.gitignore
index dad02d1..f535252 100644
--- a/.gitignore
+++ b/.gitignore
@@ -37,6 +37,7 @@ out/
 obj/
 
 # Misc
+.bin/
 *.log
 *.graphml
 coverage.db*
diff --git a/.pkgmeta b/.pkgmeta
index 522e75c..273c52d 100644
--- a/.pkgmeta
+++ b/.pkgmeta
@@ -6,7 +6,10 @@ externals:
   libs/LibStub: https://repos.wowace.com/wow/libstub/tags/1.0
   libs/CallbackHandler-1.0: https://repos.wowace.com/wow/callbackhandler/trunk/CallbackHandler-1.0
   libs/AceAddon-3.0: https://repos.wowace.com/wow/ace3/trunk/AceAddon-3.0
+  libs/AceConfig-3.0: https://repos.wowace.com/wow/ace3/trunk/AceConfig-3.0
   libs/AceConsole-3.0: https://repos.wowace.com/wow/ace3/trunk/AceConsole-3.0
+  libs/AceDB-3.0: https://repos.wowace.com/wow/ace3/trunk/AceDB-3.0
+  libs/AceDBOptions-3.0: https://repos.wowace.com/wow/ace3/trunk/AceDBOptions-3.0
   libs/AceEvent-3.0: https://repos.wowace.com/wow/ace3/trunk/AceEvent-3.0
   libs/AceGUI-3.0: https://repos.wowace.com/wow/ace3/trunk/AceGUI-3.0
   libs/AceHook-3.0: https://repos.wowace.com/wow/ace3/trunk/AceHook-3.0
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 69f483c..f412c0e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,15 +3,25 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), 
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased] Version 1.0 - 2020-06-02
+## [Unreleased] Version 0.7.0-beta - 2020-06-06
 ### Added
-- case sensitivity 
+- handle replacement via slash command
+
+## Version 0.6.0 - 2020-06-05
+### Added
+- honour capital/mixed cases for ignore case
 - consolidate consecutive matches
+- database upgrade capability
+### Changed
+- case sensitivity option reversed
+- removed obsolete WIM handling
+### Fixed
+- skip empty mapping
+- Deletion of mapping
 
 ## Version 0.5.0 - 2020-06-01
 ### Added
 - add replacements via options UI
-- handle replacement via slash command
 
 ## Version 0.4.0 - 2020-05-30
 ### Added
diff --git a/Grichelde.lua b/Grichelde.lua
index 8467389..6825fd3 100644
--- a/Grichelde.lua
+++ b/Grichelde.lua
@@ -1,17 +1,15 @@
 --[[---------------------------------------------------------------------------
-  Grichelde
-  Copyright 2020 Teilzeit-Jedi <tj@teilzeit-jedi.de>
 
-  based on Misspelled developed by Nathan Pieper - nrpieper (@) gmail (dot) com
+  Grichelde - Text Replacer
+  Copyright 2020 Teilzeit-Jedi <tj@teilzeit-jedi.de>
 
-  This code freely distributed for your use in any GPL compliant project.
-  See conditions in the LICENSE file attached.
+  This addon is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
 
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
+  You should have received a copy of the GNU General Public License
+  along with the addon. If not, see <http://www.gnu.org/licenses/gpl-3.0.txt>.
 
 -----------------------------------------------------------------------------]]
 
@@ -27,6 +25,7 @@ Grichelde.build = GetAddOnMetadata(AddonName, "X-Build") or "Experimental"
 Grichelde.hooks = {}
 Grichelde.classic = _G.WOW_PROJECT_ID == _G.WOW_PROJECT_CLASSIC
 Grichelde.debug = false
+Grichelde.trace = false
 
 -- publish to global env
 _G.Grichelde = Grichelde
@@ -35,25 +34,21 @@ _G.Grichelde = Grichelde
 function Grichelde:OnInitialize()
     -- Build Interface Options window
     self.db = self:LoadDatabase()
+    self:UpgradeDatabase()
+
     self.options, self.dialog = self:SetupOptions()
 
+    -- load replacements from database
     self:RefreshOptions("OnProfileChanged")
     self:DebugPrint(self.db.profile)
 
     self:SetupSlashCommands()
-
-    -- Watch for WIM and Prat to Load, then integrate
-    self:RegisterEvent("ADDON_LOADED", "HookIntoForOtherChatAddons")
 end
 
 function Grichelde:OnEnable()
     -- Hook in before message is sent to replace all character occurrences where replacements have been defined in the options
     self:RawHook("SendChatMessage", true)
 
-    if (_G.Misspelled) then
-        self:PrefixedPrint(self.L.Addon_Detected_Misspelled)
-    end
-
     -- tell the world we are listening
     self:Print(self.L.AddonLoaded, self.COLOR_CODES.PREFIX .. self.L.AddonName .. " " .. self.L.VersionAbbr .. self.version .. self.COLOR_CODES.CLOSE)
 end
@@ -76,40 +71,4 @@ function Grichelde:SetupSlashCommands()
 
     self:RegisterChatCommand("grichelde", HandleSlashCommand)
     self:RegisterChatCommand("gri", HandleSlashCommand)
-end
-
---- Hook into WIM to catch whisper sending event.
--- @param event string
--- @param addonName string
-function Grichelde:HookIntoForOtherChatAddons(event, addonName)
-    if event == "ADDON_LOADED" then
-        if addonName == "WIM" then
-            _G.WIM.RegisterWidgetTrigger("msg_box", "whisper,chat,w2w", "OnEnterPressed", Grichelde.EditBox_OnEnterPressed)
-
-            -- If available use the WIM API
-            if (_G.WIM.RegisterPreSendFilterText) then -- avoid error if WIM not up to date.
-                _G.WIM.RegisterPreSendFilterText(function(text)
-                    return self:CheckAndReplace(text)
-                end)
-            else
-                -- WIM sends its chat messages via the API ChatThrottleLib, which itself hooks the default SendChatMessage api
-                -- many times before Grichelde will. ChatThrottleLib might potentially load before Grichelde, so we just hook
-                -- into ChatThrottleLib to be on the safe side.
-
-                if (_G.ChatThrottleLib) then
-                    self.hooks["ChatThrottleLib"] = _G.ChatThrottleLib.SendChatMessage
-
-                    function _G.ChatThrottleLib:SendChatMessage(prio, prefix, text, ...)
-                        Grichelde:DebugPrint("ChatThrottleLib:SendChatMessage : Hook called")
-                        local replacedText = Grichelde:CheckAndReplace(text)
-                        return Grichelde.hooks["ChatThrottleLib"](_G.ChatThrottleLib, prio, prefix, replacedText, ...)
-                    end
-                end
-            end
-
-            if (_G.WIM) then
-                self:PrefixedPrint(self.L.Addon_Detected_WIM)
-            end
-        end
-    end
 end
\ No newline at end of file
diff --git a/Grichelde.toc b/Grichelde.toc
index 488f1e9..0c614f5 100644
--- a/Grichelde.toc
+++ b/Grichelde.toc
@@ -1,14 +1,15 @@
 ## Interface: 11304
 
 ## Title: Grichelde
-## Notes: Replaces characters you type in the chat box
+## Notes: Replaces characters from the chat box
 ## Notes-de: Ersetzt eingegebene Zeichen in der Chat-Zeile
-## Version: 0.5.0
+## Version: 0.6.0
 ## Author: Teilzeit-Jedi
 ## eMail: tj@teilzeit-jedi.de
 
 ## X-Build: Classic
 ## X-Curse-Project-ID: 385480
+## X-License: GPLv3
 ## X-Category: Chat/Communication
 ## X-Credits: Teilzeit-Jedi, Nathan Pieper
 ## X-Embeds: Ace3
@@ -23,5 +24,6 @@ Grichelde.lua
 GricheldeConstants.lua
 GricheldeUtils.lua
 GricheldeDatabase.lua
+GricheldeUpgrade.lua
 GricheldeOptions.lua
 GricheldeChat.lua
diff --git a/GricheldeChat.lua b/GricheldeChat.lua
index 5f0f178..b236004 100644
--- a/GricheldeChat.lua
+++ b/GricheldeChat.lua
@@ -2,8 +2,9 @@
 local _G = _G
 local Grichelde = _G.Grichelde
 
-local nilOrEmpty, ipairs, tContains, tFilter, tInsert, tConcat, find, sub, gsub, toLower, trim, length
-    = Grichelde.functions.nilOrEmpty, Grichelde.functions.ipairs, Grichelde.functions.tContains, Grichelde.functions.tFilter, Grichelde.functions.tInsert, Grichelde.functions.tConcat, Grichelde.functions.find, Grichelde.functions.sub, Grichelde.functions.gsub, Grichelde.functions.toLower, Grichelde.functions.trim, Grichelde.functions.length
+local nilOrEmpty, ipairs, spairs, tContains, tFilter, tInsert, tConcat, find, sub, isUpper, isLower, toUpper, toLower, trim, length
+    = Grichelde.functions.nilOrEmpty, Grichelde.functions.ipairs, Grichelde.functions.spairs, Grichelde.functions.tContains, Grichelde.functions.tFilter, Grichelde.functions.tInsert, Grichelde.functions.tConcat,
+      Grichelde.functions.find, Grichelde.functions.sub, Grichelde.functions.isUpper, Grichelde.functions.isLower, Grichelde.functions.toUpper, Grichelde.functions.toLower, Grichelde.functions.trim, Grichelde.functions.length
 
 --- Before a chat message is sent, check if replacement is required and replace the text accordingly.
 -- @param message string
@@ -13,7 +14,6 @@ local nilOrEmpty, ipairs, tContains, tFilter, tInsert, tConcat, find, sub, gsub,
 function Grichelde:SendChatMessage(message, type, language, channel, ...)
     local replacedText = self:CheckAndReplace(message, type)
 
-    self:DebugPrint("SendChatMessage : replacedText:", replacedText)
 
     -- Send text in chunks if length exceeds 255 bytes after replacement
     local chunks = self:SplitText(replacedText)
@@ -55,7 +55,7 @@ function Grichelde:CheckReplacement(text, channel)
     )
     self:DebugPrint("CheckReplacement : allowed channels:", tConcat(allowedChannels, ", "))
     local type = self:ConvertBlizChannelToType(channel)
-    if (type ~= nil and not tContains(allowedChannels, type)) then
+    if (type == nil or not tContains(allowedChannels, type)) then
         self:DebugPrint("CheckReplacement : skip channel type:", type)
         return false
     end
@@ -103,7 +103,7 @@ function Grichelde:ReplaceText(text)
 
     while current <= length(newText) do
         local currentChar = sub(newText, current, current)
-        self:DebugPrint("current/char : %s,%s", current, currentChar)
+        self:TracePrint("current/char : %s,%s", current, currentChar)
 
         if ( not tContains(lookAheads, currentChar)) then
             current = current + 1
@@ -194,17 +194,181 @@ end
 -- @param text string
 -- @return string
 function Grichelde:ReplaceCharacters(text)
-    -- todo: read from options
-    -- todo: case (in)sensitivity
-    -- todo: consolidate consecutive
-    -- todo: prevent infinite loops - is that even possible?
-    local replacement = text
-    replacement = gsub(replacement, "s", "ch")
-    replacement = gsub(replacement, "S", "Ch")
-    replacement = gsub(replacement, "t", "k")
-    replacement = gsub(replacement, "T", "K")
-    self:DebugPrint("ReplaceCharacters : replaced \"%s\" with \"%s\"", text, replacement)
-    return replacement
+    local replacements = self.db.profile.replacements or {}
+    self:DebugPrint("ReplaceCharacters : replacements")
+    self:DebugPrint(replacements)
+
+    local result = text
+    local consolidate = {}
+
+    -- replacements are done first
+    for replName, replTable in spairs(replacements) do
+        local before = result
+        local search = replTable.searchText
+
+        if not nilOrEmpty(search) then
+            local replace = replTable.replaceText
+            consolidate[replName] = {}
+
+            if replTable.ignoreCase then
+                self:DebugPrint("ReplaceCharacters : \"%s => %s\" (ignoreCase)", search, replace)
+                local pos, offset = 1, 0
+                local lowerResult = toLower(result)
+                local lowerSearch = toLower(search)
+
+                local pos1, pos2 = find(lowerResult, lowerSearch, pos)
+                while (pos1 and pos2) do
+                    self:TracePrint("pos1: %d, pos2: %d", pos1, pos2)
+                    local pre = sub(result, 1, pos1 - 1 + offset)
+                    local match = sub(result, pos1 + offset, pos2 + offset)
+                    local post = sub(result, pos2 + 1 + offset)
+                    self:TracePrint("pre: %s, match: %s, post: %s", pre, match, post)
+
+                    -- keep cases
+                    local repl = ""
+                    local lastCase = nil
+                    for p = pos1, pos2 do
+                        self:TracePrint("p: %d", p)
+                        local c = sub(match, p - pos1 + 1, p - pos1 + 1)
+                        local r = sub(replace, p - pos1 + 1, p - pos1 + 1) or ""
+
+                        if (isUpper(c)) then            -- all UPPER-CASE letter
+                            lastCase = true
+                            repl = repl .. toUpper(r)
+                        elseif (isLower(match)) then    -- all lower_case letter
+                            lastCase = false
+                            repl = repl .. toLower(r)
+                        else                            -- no letter
+                            lastCase = nil
+                            repl = repl .. r
+                        end
+                        self:TracePrint("character: %s, %s", c, r)
+                    end
+
+                    self:TracePrint("length %d > %d", length(replace), pos2 - pos1 + 1)
+                    if (length(replace) > pos2 - pos1 + 1) then
+                        local remainingReplace = sub(replace, pos2 - pos1 + 2)
+                        local nextLetter = sub(post, 1, 1)
+
+                        self:TracePrint("rest: %s, n: %s, lastCase: %s", remainingReplace, nextLetter, lastCase)
+
+                        if (isUpper(nextLetter)) then
+                            repl = repl .. toUpper(remainingReplace)
+                        elseif (isLower(nextLetter)) then
+                            repl = repl .. toLower(remainingReplace)
+                        else
+                            -- no letter
+                            repl = repl .. remainingReplace
+--                          if lastCase == nil then
+--                              repl = repl .. remainingReplace
+--                          elseif lastCase == false then
+--                              repl = repl .. toLower(remainingReplace)
+--                          else
+--                              repl = repl .. toUpper(remainingReplace)
+--                          end
+                        end
+                    end
+
+                    -- actual replacement
+                    result = pre .. repl .. post
+                    self:DebugPrint("result: %s", result)
+
+                    -- remember positions for consolidate
+                    if replTable.consolidate then
+                        tInsert(consolidate[replName], pos1 + offset)
+                    end
+
+                    -- replacement text can be longer or shorter the resulting text
+                    -- after replacement result and lowerResult can have different sizes
+                    offset = offset + length(repl) - length(lowerSearch)
+                    -- update values for next iteration
+                    pos = pos2 + 1
+                    pos1, pos2 = find(lowerResult, lowerSearch, pos)
+                end
+            else
+                -- exact case
+                self:DebugPrint("ReplaceCharacters : \"%s => %s\" (exact case)", search, replace)
+                local pos, offset = 1, 0
+                local oldResult = result
+
+                local pos1, pos2 = find(oldResult, search, pos)
+                while (pos1 and pos2) do
+                    self:TracePrint("pos1: %d, pos2: %d", pos1, pos2)
+                    local pre = sub(result, 1, pos1 - 1 + offset)
+                    local post = sub(result, pos2 + 1 + offset)
+                    self:TracePrint("pre: %s, post: %s", pre, post)
+
+                    -- actual replacement
+                    result = pre .. replace .. post
+                    self:DebugPrint("result: %s", result)
+
+                    -- remember positions for consolidate
+                    if replTable.consolidate then
+                        tInsert(consolidate[replName], pos1 + offset)
+                    end
+
+                    -- replacement text can lengthen or shorten the resulting text
+                    -- after replacement result and lowerResult can have different sizes
+                    offset = offset + length(replace) - length(search)
+                    -- update values for next iteration
+                    pos = pos2 + 1
+                    pos1, pos2 = find(oldResult, search, pos)
+                end
+            end
+
+            if before ~= result then
+                self:DebugPrint("ReplaceCharacters : replaced \"%s\" with \"%s\"", before, result)
+            end
+        else
+            self:DebugPrint("ReplaceCharacters : Skip replacement for empty mapping")
+        end
+    end
+
+    -- consolidation is done last
+    for replName, replTable in spairs(replacements) do
+        local before = result
+        --local search = replTable.searchText
+        local search = replTable.searchText
+
+        if not nilOrEmpty(search) then
+            local replace = replTable.replaceText
+            local lowerResult = toLower(result)
+            local offset = 0
+
+            if replTable.consolidate then
+                self:DebugPrint("ReplaceCharacters : consolidating \"%s => %s\"", search, replace)
+                self:DebugPrint("consolidate[" .. replName .. "] is:")
+                self:DebugPrint(consolidate[replName])
+
+                for _, pos1 in spairs(consolidate[replName]) do
+                    local pos2 = pos1 + length(replace) - 1
+                    self:TracePrint("pos1: %d, pos2: %d", pos1, pos2)
+                    local match = sub(lowerResult, pos1, pos2)
+                    local next = sub(lowerResult, pos2 + 1, pos2 + 1 + pos2 - pos1)
+                    self:TracePrint("match: %s, next: %s", match, next)
+
+                    local _, p2 = find(next, "^" .. match)
+                    self:TracePrint("p2: %d", p2)
+                    if (p2) then
+                        result = sub(result, 1, pos2 + offset) .. sub(result, pos2 + 1 + p2 + offset)
+
+                        -- consolidation will shorten the resulting text
+                        offset = offset + length(result) - length(lowerResult)
+                    end
+                    self:DebugPrint("result: %s", result)
+                end
+            end
+
+            if before ~= result then
+                self:DebugPrint("ReplaceCharacters : consolidate \"%s\" with \"%s\"", before, result)
+            end
+        else
+            self:DebugPrint("ReplaceCharacters : Skip consolidation for empty mapping")
+        end
+    end
+
+    self:DebugPrint("ReplaceCharacters : final text:", result)
+    return result
 end
 
 --- Splits a long text in longest possible chunks of <= 255 length, split at last available space
diff --git a/GricheldeConstants.lua b/GricheldeConstants.lua
index 58f85c1..212e1e7 100644
--- a/GricheldeConstants.lua
+++ b/GricheldeConstants.lua
@@ -12,7 +12,9 @@ Grichelde.COLOR_CODES.NORMAL      = _G.NORMAL_FONT_COLOR_CODE      or "|cffffd20
 Grichelde.COLOR_CODES.HIGHLIGHT	  = _G.HIGHLIGHT_FONT_COLOR_CODE   or "|cffffffff";
 Grichelde.COLOR_CODES.RED         = _G.RED_FONT_COLOR_CODE         or "|cffff2020";
 Grichelde.COLOR_CODES.GREEN       = _G.GREEN_FONT_COLOR_CODE       or "|cff20ff20";
+Grichelde.COLOR_CODES.LIGHTGRAY   = "|cffC0C0C0";
 Grichelde.COLOR_CODES.GRAY        = _G.GRAY_FONT_COLOR_CODE        or "|cff808080";
+Grichelde.COLOR_CODES.DARKGRAY    = "|cff404040";
 Grichelde.COLOR_CODES.YELLOW      = _G.YELLOW_FONT_COLOR_CODE      or "|cffffff00";
 Grichelde.COLOR_CODES.LIGHTYELLOW = _G.LIGHTYELLOW_FONT_COLOR_CODE or "|cffffff9a";
 Grichelde.COLOR_CODES.ORANGE      = _G.ORANGE_FONT_COLOR_CODE      or "|cffff7f3f";
@@ -24,7 +26,7 @@ local function nilOrEmpty(s)
     return s == nil or s:trim() == ""
 end
 
-local function spairs(t , orderFunc)
+local function spairs(t, orderFunc)
     -- collect the keys
     local sortedKeys = {}
     -- for every non-nil value
@@ -35,6 +37,7 @@ local function spairs(t , orderFunc)
     if orderFunc then
         Grichelde.functions.tSort(sortedKeys, function(a, b) return orderFunc(sortedKeys, a, b) end)
     else
+        -- lexicographical order
         Grichelde.functions.tSort(sortedKeys)
     end
 
@@ -86,6 +89,28 @@ local function tClone(orig)
     return copy
 end
 
+local function isChar(char)
+    return Grichelde.functions.find(char, "%a+")
+end
+
+local function isNumber(digit)
+    return Grichelde.functions.find(Grichelde.functions.toString(digit), "%d+")
+end
+
+local function isUpper(char)
+    return Grichelde.functions.isChar(char) and char == Grichelde.functions.toUpper(char)
+end
+
+local function isLower(char)
+    return Grichelde.functions.isChar(char) and char == Grichelde.functions.toLower(char)
+end
+
+local function isCapital(word)
+    return Grichelde.functions.legnth(word) > 1
+        and Grichelde.functions.isUpper(Grichelde.functions.sub(word,1,1))
+        and Grichelde.functions.isLower(Grichelde.functions.sub(word,2))
+end
+
 -- faster function lookups by mapping to local refs
 Grichelde.functions = {}
 Grichelde.functions.type         = _G.type
@@ -112,8 +137,13 @@ Grichelde.functions.gsub         = _G.string.gsub
 Grichelde.functions.match        = _G.strmatch
 Grichelde.functions.join         = _G.strjoin
 Grichelde.functions.split        = _G.strsplit
-Grichelde.functions.toLower      = _G.strlower
 Grichelde.functions.toUpper      = _G.strupper
+Grichelde.functions.toLower      = _G.strlower
+Grichelde.functions.isChar       = isChar
+Grichelde.functions.isNumber     = isNumber
+Grichelde.functions.isUpper      = isUpper
+Grichelde.functions.isLower      = isLower
+Grichelde.functions.isCapital    = isCapital
 Grichelde.functions.format       = _G.string.format
 Grichelde.functions.rep          = _G.string.rep
 Grichelde.functions.trim         = _G.strtrim
diff --git a/GricheldeDatabase.lua b/GricheldeDatabase.lua
index 48aaadc..2bb8ea3 100644
--- a/GricheldeDatabase.lua
+++ b/GricheldeDatabase.lua
@@ -2,50 +2,52 @@
 local _G = _G
 local Grichelde = _G.Grichelde
 
-local pairs, ipairs, tInsert, tSort, unpack, join, toString
-    = Grichelde.functions.pairs, Grichelde.functions.ipairs, Grichelde.functions.tInsert, Grichelde.functions.tSort, Grichelde.functions.unpack, Grichelde.functions.join, Grichelde.functions.toString
+local spairs, unpack, join, toString
+    = Grichelde.functions.spairs, Grichelde.functions.unpack, Grichelde.functions.join, Grichelde.functions.toString
 
-local defaultConfig = {
-    global = {},
-    profile = {
-        enabled = true,
-        channels = {
-            ["*"] = false,
-            say = true,
-            emote = false,
-            yell = true,
-            party = true,
-            guild = true,
-            officer = true,
-        },
-        replacements = {
-            ["**"] = {
-                order = 9999,
-                searchText = "",
-                replaceText = "",
-                caseSensitive = false,
-                consolidate = true,
+function Grichelde:GetDefaultConfig()
+    return {
+        global = {},
+        profile = {
+            enabled = true,
+            channels = {
+                ["*"] = false,
+                say = true,
+                emote = false,
+                yell = true,
+                party = true,
+                guild = true,
+                officer = true,
             },
-            replacement_0 = {
-                order = 5,
-                searchText = "s",
-                replaceText = "ch",
-                caseSensitive = false,
-                consolidate = true,
-            },
-            replacement_1 = {
-                order = 9,
-                searchText = "t",
-                replaceText = "ck",
-                caseSensitive = false,
-                consolidate = true,
+            replacements = {
+                ["**"] = {
+                    order = 9999,
+                    searchText = "",
+                    replaceText = "",
+                    ignoreCase = true,
+                    consolidate = true,
+                },
+                replacement_0 = {
+                    order = 5,
+                    searchText = "s",
+                    replaceText = "ch",
+                    ignoreCase = true,
+                    consolidate = true,
+                },
+                replacement_1 = {
+                    order = 9,
+                    searchText = "t",
+                    replaceText = "ck",
+                    ignoreCase = true,
+                    consolidate = true,
+                }
             }
         }
     }
-}
+end
 
 function Grichelde:LoadDatabase()
-    local db = LibStub("AceDB-3.0"):New(self.name .."DB", defaultConfig, true)
+    local db = LibStub("AceDB-3.0"):New(self.name .."DB", self:GetDefaultConfig(), true)
 
     db.RegisterCallback(self, "OnNewProfile", "RefreshOptions")
     db.RegisterCallback(self, "OnProfileChanged", "RefreshOptions")
@@ -76,7 +78,7 @@ function Grichelde:ReadFromDatabase(info)
         path = path + 1
     end
     local optionPath = join(".", unpack(info, 1, #info))
-    self:DebugPrint("read option \"%s\": %s", optionPath, toString(option))
+    self:TracePrint("read option \"%s\": %s", optionPath, toString(option))
     return option
 end
 
@@ -86,37 +88,19 @@ end
 -- @return table
 function Grichelde:ReorderReplacements(replacementsTable)
     local replacements = replacementsTable or {}
-    local sortedByOrder = {}
-    for replName, _ in pairs(replacements) do
-        tInsert(sortedByOrder, replName)
-    end
-
-    tSort(sortedByOrder)    -- lexicographical order will do for non-nil values
-    --[[tSort(sortedByOrder, function(a, b)
-        self:DebugPrint("ReorderReplacements : sort ", a, b)
-        if a then
-            if b then
-                return a < b
-            else
-                return a
-            end
-        else
-            return b
-        end
-    end)]]
-
-    self:DebugPrint("ReorderReplacements : sortedByOrder")
-    self:DebugPrint(sortedByOrder)
+    self:TracePrint("ReorderReplacements : unsorted table")
+    self:TracePrint(replacementsTable)
 
     local sortedReplacements = {}
+
     local index = 0
-    for _, replName in ipairs(sortedByOrder) do
-        sortedReplacements["replacement_"..index] = replacements[replName]
-        sortedReplacements["replacement_"..index].order = index
+    for _, replTable in spairs(replacements) do
+        sortedReplacements["replacement_" .. index] = replTable
+        sortedReplacements["replacement_" .. index].order = index
         index = index + 1
     end
 
-    --self:DebugPrint("ReorderReplacements : sorted table")
-    --self:DebugPrint(sortedReplacements)
+    self:TracePrint("ReorderReplacements : sorted table")
+    self:TracePrint(sortedReplacements)
     return sortedReplacements
 end
\ No newline at end of file
diff --git a/GricheldeOptions.lua b/GricheldeOptions.lua
index 39e8471..5960493 100644
--- a/GricheldeOptions.lua
+++ b/GricheldeOptions.lua
@@ -147,11 +147,11 @@ function Grichelde:CreateReplacement(offset)
                 name = self.L.Options_Replacement_ReplaceText_Name,
                 desc = self.L.Options_Replacement_ReplaceText_Desc,
             },
-            caseSensitive = {
+            ignoreCase = {
                 order = 2,
                 type = "toggle",
-                name = self.L.Options_Replacement_CaseSensitive_Name,
-                desc = self.L.Options_Replacement_CaseSensitive_Desc,
+                name = self.L.Options_Replacement_IgnoreCase_Name,
+                desc = self.L.Options_Replacement_IgnoreCase_Desc,
             },
             consolidate = {
                 order = 3,
@@ -225,15 +225,16 @@ function Grichelde:RefreshOptions(event)
         self:DebugPrint("Refreshing Profile %s on options change: %s", self.db:GetCurrentProfile(), event)
     end
 
-    self:RefreshReplacements(self:ReorderReplacements(self.db.profile.replacements))
+    self.db.profile.replacements = self:ReorderReplacements(self.db.profile.replacements)
+    self:RefreshReplacements(self.db.profile.replacements)
 end
 
 --- Create UI options for rhe given replacement table (from DB).
 --- Usually called with with self.db.profile.replacements
 -- @param replacementsTable
 function Grichelde:RefreshReplacements(replacementsTable)
-    --self:DebugPrint("RefreshReplacements : DB table:")
-    --self:DebugPrint(replacementsTable)
+    self:TracePrint("RefreshReplacements : DB table:")
+    self:TracePrint(replacementsTable)
 
     -- remove all previous replacements from options (not DB), except header and buttons
     local replacements = self.options.args.replacements.args or {}
@@ -248,22 +249,25 @@ function Grichelde:RefreshReplacements(replacementsTable)
         replacements[replName] = self:CreateReplacement(toNumber(replNumber))
     end
 
-    --self:DebugPrint("RefreshReplacements : UI options:")
-    --self:DebugPrint(replacements)
+    self:TracePrint("RefreshReplacements : UI options:")
+    self:TracePrint(replacements)
 
     self.dialog:ConfigTableChanged(nil, self.name)
 end
 
 function Grichelde:AddReplacement()
     local replacements = self.db.profile.replacements
+    self:DebugPrint("AddReplacements : old DB entries:")
+    self:DebugPrint(replacements)
+
     local maxRepl = tSize(replacements)
     local newMapping = "replacement_" .. maxRepl
     self:DebugPrint("AddReplacement : new replacement key:", newMapping)
 
     -- setting replacements[newMapping] = {} will deactivate defaults
     replacements[newMapping].order = maxRepl
-    --self:DebugPrint("AddReplacements : all DB entries:")
-    --self:DebugPrint(replacements)
+    self:DebugPrint("AddReplacements : new DB entries:")
+    self:DebugPrint(replacements)
 
     --self.db.profile.replacements = replacements
     self:RefreshOptions("AddReplacement " .. newMapping)
diff --git a/GricheldeUpgrade.lua b/GricheldeUpgrade.lua
new file mode 100644
index 0000000..0a6c742
--- /dev/null
+++ b/GricheldeUpgrade.lua
@@ -0,0 +1,71 @@
+-- read namespace from global env
+local _G = _G
+local Grichelde = _G.Grichelde
+
+local pairs, find, toNumber = Grichelde.functions.pairs, Grichelde.functions.find, Grichelde.functions.toNumber
+
+function Grichelde:Upgrade_To_v060()
+    self:PrefixedPrint(self.L.Upgrade_ToVersion, Grichelde.COLOR_CODES.ORANGE .. "0.6.0" .. Grichelde.COLOR_CODES.CLOSE)
+
+    local replacements = self.db.profile.replacements or {}
+    self:DebugPrint("Upgrade_To_060 : old database")
+    self:DebugPrint(replacements)
+
+    for _, replTable in pairs(replacements) do
+        replTable.ignoreCase = not replTable["caseSensitive"]
+        replTable["caseSensitive"] = nil
+    end
+
+    self:DebugPrint("Upgrade_To_060 : new database")
+    self:DebugPrint(replacements)
+    return 0, 6, 0
+end
+
+--[[
+function Grichelde:Upgrade_To_v061()
+    return 0, 6, 1
+end
+
+function Grichelde:Upgrade_To_v070()
+    return 0, 7, 0
+end
+]]
+
+function Grichelde:UpgradeDatabase()
+    local dbVersion = self.db.global.version or "0.0.0"
+    self:DebugPrint("Database version:", dbVersion)
+
+    local _, _, maj, min, pat = find(dbVersion, "(%d+)%.(%d+)%.(%d+).*")
+    local major, minor, patch = toNumber(maj) or 0, toNumber(min) or 0, toNumber(pat) or 0
+
+    local upgrade = 0
+    local error = false
+
+    if major == 0 then
+        if minor < 6 then
+            upgrade = upgrade + 1
+            major, minor, patch = self:Upgrade_To_v060(dbVersion)
+        end
+--[[
+        if minor == 6 then
+            if patch < 1 then
+                upgrade = upgrade + 1
+                major, minor, patch = self:Upgrade_To_v061(dbVersion)
+            end
+        end
+        if minor < 7 then
+            upgrade = upgrade + 1
+            major, minor, patch = self:Upgrade_To_v070(dbVersion)
+        end
+]]
+    end
+
+    if upgrade == 0 then
+        self:DebugPrint("Database up-to-date")
+    else
+        if not error then
+            self.db.global.version = self.version
+            self:PrefixedPrint(Grichelde.COLOR_CODES.GREEN .. self.L.Upgrade_Successful .. Grichelde.COLOR_CODES.CLOSE)
+        end
+    end
+end
\ No newline at end of file
diff --git a/GricheldeUtils.lua b/GricheldeUtils.lua
index 9bec266..55c852b 100644
--- a/GricheldeUtils.lua
+++ b/GricheldeUtils.lua
@@ -36,9 +36,9 @@ local function tPrint(val, indent, known, printFunc)
         if tSize(val) > 0 then
             for key, value in pairs(val) do
                 if value == nil then
-                    printF(rep(" ", indent) .. plainValue(key) .. "= <nil>")
+                    printF(rep(" ", indent) .. plainValue(key) .. " = <nil>")
                 elseif type(value) == "table" then
-                    printF(rep(" ", indent) .. plainValue(key) .. "= {")
+                    printF(rep(" ", indent) .. plainValue(key) .. " = {")
                     if tSize(value) > 0 then
                         if not known[value] then
                             tPrint(value, indent + 4, known, printF)
@@ -65,9 +65,9 @@ function Grichelde:SplitOnFirstMatch(text, delimPattern, start)
     if text == nil then return nil end
     local pattern = "^(.-)" .. (delimPattern or " " ) .."(.*)"
     local pos = start or 1
-    self:DebugPrint("SplitOnFirstMatch : text: %s, pattern: %s, start: %d", text, pattern, start)
+    self:TracePrint("SplitOnFirstMatch : text: %s, pattern: %s, start: %d", text, pattern, start)
     local _, _, left, right = find(text, pattern, pos)
-    self:DebugPrint("SplitOnFirstMatch : left: %s, right: %s", left, right)
+    self:TracePrint("SplitOnFirstMatch : left: %s, right: %s", left, right)
     return left or text, right
 end
 
@@ -75,9 +75,9 @@ end
 function Grichelde:SplitOnLastMatch(text, delimPattern, start)
     local pattern = "(.*)" .. (delimPattern or " ") .. "(.-)$"
     local pos = start or 1
-    self:DebugPrint("SplitOnLastMatch : text: %s, pattern: %s, start: %d", text, pattern, start)
+    self:TracePrint("SplitOnLastMatch : text: %s, pattern: %s, start: %d", text, pattern, start)
     local _, _, left, right = find(text, pattern, pos)
-    self:DebugPrint("SplitOnLastMatch : left: %s, right: %s", left, right)
+    self:TracePrint("SplitOnLastMatch : left: %s, right: %s", left, right)
     return left, right or text
 end
 
@@ -153,4 +153,39 @@ function Grichelde:DebugPrint(obj, ...)
             end
         end
     end
+end
+
+function Grichelde:TracePrint(obj, ...)
+    local function prefixedTracePrint(...)
+        print(self.COLOR_CODES.DARKGRAY .. self.L.AddonName .. self.COLOR_CODES.CLOSE .. ":", self:Format(...))
+    end
+
+    if (self.debug and self.trace) then
+        if obj == nil then
+            prefixedTracePrint("<nil>")
+        else
+            if type(obj) == "string" then
+                local l = select("#", ...)
+                if ( l == 0 or not find(obj, "%%")) then
+                    prefixedTracePrint(obj, ...)
+                else
+                    -- sanitize nil values in vararg
+                    local packed = { ... }
+                    for i = 1, l do
+                        packed[i] = toString(packed[i]) or "nil"
+                    end
+
+--                  print("packed = ", packed)
+--                  self:tPrint(packed)
+                    -- cannot assign unpacked to a vararg variable and print it for debug
+                    local fmtMsg = format(obj, unpack(packed, 1, l)) -- manually set count as unpack() stops on nil (bug with #table)
+                    prefixedTracePrint(fmtMsg)
+                end
+            elseif type(obj) == "table" then
+                tPrint(obj, 0, {}, prefixedTracePrint)
+            else
+                prefixedTracePrint(plainValue(obj))
+            end
+        end
+    end
 end
\ No newline at end of file
diff --git a/localisation/deDE.lua b/localisation/deDE.lua
index 691ce4c..af5333c 100644
--- a/localisation/deDE.lua
+++ b/localisation/deDE.lua
@@ -5,8 +5,8 @@ if not L then return end
 L.AddonName = "Grichelde"
 L.VersionAbbr = "v"
 L.AddonLoaded = "%s hilft Euch jetzt bei euren Sprachschwierigkeiten."
-L.Addon_Detected_Misspelled = "Das Addon 'Misspelled' wurde erkannt und alle Nachrichten werden automatisch bereinigt."
-L.Addon_Detected_WIM = "Das Addon 'WIM' wurde erkannt und alle Flüsternnachrichten aus IM-Fenster werden behandelt."
+L.Upgrade_ToVersion = "Hebe Databank auf Version %s an."
+L.Upgrade_Successful = "Upgrade erfolgreich."
 
 -- profiles
 L.Profiles_Available = "Verf\195\188gbare Profile:"
@@ -68,8 +68,8 @@ L.Options_Replacement_SearchText_Name = "Suchtext:"
 L.Options_Replacement_SearchText_Desc = "Dieser Text wird in der Chateingabe gesucht."
 L.Options_Replacement_ReplaceText_Name = "Ersetzung:"
 L.Options_Replacement_ReplaceText_Desc = "Jeder Suchtreffer wird mit diesem Text ersetzt."
-L.Options_Replacement_CaseSensitive_Name = "Gro\195\159- und Kleinschreibung beachten"
-L.Options_Replacement_CaseSensitive_Desc = "Groß\195\159buchstaben werden mit Gro\195\159buchstaben ersetzt."
+L.Options_Replacement_IgnoreCase_Name = "ignoriere Gro\195\159- und Kleinschreibung"
+L.Options_Replacement_IgnoreCase_Desc = "Wenn nicht gesetzt, muss die Groß\195\159- und Kleinschreibung des Suchtextes exakt \195\188berein stimmen.|nDie Groß\195\159schreibung jedes Zeichens wird bei der Ersetzung \195\188bernommen."
 L.Options_Replacement_Consolidate_Name = "Fa\195\159e aufeinanderfolgende Treffer zusammen"
 L.Options_Replacement_Consolidate_Desc = "Wenn durch die Ersetzung die Zeichenfolge mehrfach hintereinander steht,|nfasse sie zu einem Vorkommen zusammen."
 L.Options_Replacement_Delete_Name = "L\195\182schen"
diff --git a/localisation/enUS.lua b/localisation/enUS.lua
index f6c293c..bdf82ee 100644
--- a/localisation/enUS.lua
+++ b/localisation/enUS.lua
@@ -5,9 +5,8 @@ if not L then return end
 L.AddonName = "Grichelde"
 L.VersionAbbr = "v"
 L.AddonLoaded = "%s now helps you with your spelling disabilities."
-L.Addon_Detected_Misspelled = "The Addon 'Misspelled' has been detected and any messsage will be cleansed automatically."
-L.Addon_Detected_WIM = "The Addon 'WIM' has been detected and any whispers will be handled from IM windows."
-
+L.Upgrade_ToVersion = "Upgrade database to version %s."
+L.Upgrade_Successful = "Upgrade successful."
 
 -- profiles
 L.Profiles_Available = "Available profiles:"
@@ -69,8 +68,8 @@ L.Options_Replacement_SearchText_Name = "Search for:"
 L.Options_Replacement_SearchText_Desc = "This text is looked up in your chat input box."
 L.Options_Replacement_ReplaceText_Name = "Replacement:"
 L.Options_Replacement_ReplaceText_Desc = "Any match will be replaced with this text."
-L.Options_Replacement_CaseSensitive_Name = "case sensitive"
-L.Options_Replacement_CaseSensitive_Desc = "Will not replace occurrences if cases differ."
+L.Options_Replacement_IgnoreCase_Name = "ignore case"
+L.Options_Replacement_IgnoreCase_Desc = "When deactivated matches are case-sensitive.|nThe case for each letter of the matching text is honoured when replaced."
 L.Options_Replacement_Consolidate_Name = "consolidate consecutive matches"
 L.Options_Replacement_Consolidate_Desc = "If after the replacement a text sequence is repeated|ndirectly after another, treat them as one occurrence."
 L.Options_Replacement_Delete_Name = "Delete"