diff --git a/abrechenbarkeit.lua b/abrechenbarkeit.lua
index 7de97ac..2cf0ba3 100755
--- a/abrechenbarkeit.lua
+++ b/abrechenbarkeit.lua
@@ -17,14 +17,18 @@
     along with this program.  If not, see <https://www.gnu.org/licenses/>.
 ]] --
 
--- replace german chars with a better %w that allows unicode
+-- TODO: allow unicode
+-- TODO: somehow remove _opt variants
 local matchers = {
     time = "(%d+)",
-    user = "([%w_@ -öäüÖÄÜßẞ]+)",
+    user = "([%w_@ -]+)",
     amount = "(-?%d+)",
-    comment = "([%w_ -öäüÖÄÜßẞ]*)",
-    barcode = "([%w_-]*)",
-    name = "([%w_ -öäüÖÄÜßẞ]*)",
+    amount_opt = "(-?%d*)",
+    comment = "([%w_ -]+)",
+    comment_opt = "([%w_ -]*)",
+    barcode = "([%w_-]+)",
+    barcode_opt = "([%w_-]*)",
+    name = "([%w_ -]+)",
 }
 local matchers_global = (function()
     local s = {}
@@ -235,7 +239,7 @@ local function read_log()
             return nil
         end
         local time, user_src, user_dst, amount, pcode, pcount, comment = string.match(l,
-            format("{time},{user},{user},{amount},{barcode},{amount},{comment}", matchers))
+            format("^{time},{user},{user},{amount},{barcode_opt},{amount_opt},{comment_opt}$", matchers))
         return tonumber(time), user_src, user_dst, tonumber(amount), pcode, tonumber(pcount), comment
     end
 end
@@ -251,7 +255,7 @@ local function read_products()
         if l == "" or l == nil then
             return nil
         end
-        local barcode, price, user, name = string.match(l, "{barcode},{amount},{user},{name}")
+        local barcode, price, user, name = string.match(l, format("^{barcode},{amount},{user}?,{name}$", matchers))
         return barcode, tonumber(price), user, name
     end
 end
@@ -289,12 +293,12 @@ local function get_active_users()
     for time, user_src, user_dst, amount, _, _, _ in read_log() do
         user_balances[user_src] = {
             time = time,
-            user_src = user_src,
+            name = user_src,
             balance = (user_balances[user_src] or { balance = 0 }).balance - amount
         }
         user_balances[user_dst] = {
             time = time,
-            user_dst = user_dst,
+            name = user_dst,
             balance = (user_balances[user_dst] or { balance = 0 }).balance + amount
         }
     end
@@ -308,15 +312,15 @@ local function get_active_users()
     return users
 end
 
-local function r_user_post(username)
+local function r_transaction_post()
     local data = form_data()
-    local user_src = data.user_src or username
+    local user_src = data.user_src
     local user_dst = data.user_dst
     local amount = tonumber(data.amount)
     local pcode = data.pcode
     local pcount = tonumber(data.pcount)
     local comment = data.comment
-    if pcode then
+    if pcode ~= nil and pcode ~= "" then
         local exists = false
         for p_barcode, p_amount, p_user, p_name in read_products() do
             if p_barcode == pcode then
@@ -332,11 +336,11 @@ local function r_user_post(username)
             return error_box("unknown product")
         end
     end
-    user_dst = user_dst or "@global"
+    user_src = user_src or "@global"
     if amount == nil then
         return error_box("amount invalid")
     end
-    if comment == nil or comment:match(matchers_global.comment) == nil then
+    if comment == nil or comment:match(matchers_global.comment_opt) == nil then
         return error_box("comment invalid")
     end
     if user_src == nil or user_src:match(matchers_global.user) == nil then
@@ -368,7 +372,7 @@ end
 local function r_user(username)
     local notif = nil
     if method == "POST" then
-        notif = r_user_post(username)
+        notif = r_transaction_post()
     end
     return respond(200, string.format("Abrechenbarheit: %s", username), function()
         print(format("<h1>{username}</h1>", { username = username }))
@@ -393,10 +397,12 @@ local function r_user(username)
             for _, amount in ipairs({ 50, 100, 150, 200, 500, 1000 }) do
                 local a = amount * type
                 print(format([[<form action="" method="POST">
-                    <input type="number" name="amount" id="amount" value="{a_raw}" hidden />
-                    <input type="text" name="comment" id="comment" value="" hidden />
+                    <input type="text" name="user_dst" value="{!username}" hidden />
+                    <input type="number" name="amount" value="{a_raw}" hidden />
+                    <input type="text" name="comment" value="" hidden />
                     <input type="submit" value="{amount}" class="amount-{sign} button" />
                 </form>]], {
+                    username = username,
                     a_raw = a,
                     amount = format_amount(a),
                     sign = a < 0 and "neg" or "pos"
@@ -407,6 +413,7 @@ local function r_user(username)
         print(format([[
             <form class="transaction box backgroundbox" action="" method="POST">
                 <h3>{+user.form.transaction}</h3>
+                <input type="text" name="user_dst" value="{!username}" hidden />
                 <label for="amount">Amount (ct): </label>
                 <input type="number" name="amount" id="amount" />
                 <label for="comment">Comment: </label>
@@ -415,6 +422,7 @@ local function r_user(username)
             </form>
             <form class="transaction box backgroundbox" action="" method="POST" id="buy_product">
                 <h3>{+user.form.buy}</h3>
+                <input type="text" name="user_dst" value="{!username}" hidden />
                 <input type="text" name="negate_pcount" value="1" hidden />
                 <label for="pcount">Count: </label>
                 <input type="number" name="pcount" id="pcount" value="1" />
@@ -424,6 +432,7 @@ local function r_user(username)
             </form>
             <form class="transaction box backgroundbox" action="" method="POST" id="buy_product">
                 <h3>{+user.form.restock}</h3>
+                <input type="text" name="user_dst" value="{!username}" hidden />
                 <label for="pcount">{+field.count}: </label>
                 <input type="number" name="pcount" id="pcount" value="1" />
                 <label for="amount">{+field.upstream_price}: </label>
@@ -432,13 +441,18 @@ local function r_user(username)
                 <input type="text" name="pcode" id="pcode" />
                 <input type="submit" value="{+user.form.restock.submit}" class="button amount-pos" />
             </form>
-        ]]))
+        ]], { username = username }))
         print("</div>")
     end)
 end
 
 local function r_log(filter)
+    local notif = nil
+    if method == "POST" then
+        notif = r_transaction_post()
+    end
     return respond(200, "Abrechnungen", function()
+        if notif then print(notif) end
         print([[<table class="log"]])
         print(format([[<thead><tr>
             <th>{+field.time}</th>
@@ -455,17 +469,17 @@ local function r_log(filter)
                 print(format([[
                     <tr>
                         <td>{time} ({time_delta})</td>
-                        <td>{user_src} → {user_dst</td>
+                        <td>{user_src} → {user_dst}</td>
                         {amount}
                         <td>{pcode}</td>
                         <td>{pcount}</td>
                         <td>{comment}</td>
                         <td>
-                            <form action="/?transaction" method="POST">
-                                <input type="number" name="user_src" value="{user_src}" hidden />
-                                <input type="number" name="user_dst" value="{user_dst}" hidden />
+                            <form action="/?log" method="POST">
+                                <input type="text" name="user_src" value="{user_src}" hidden />
+                                <input type="text" name="user_dst" value="{user_dst}" hidden />
                                 <input type="number" name="amount" value="{revert_amount}" hidden />
-                                <input type="number" name="pcode" value="{pcode}" hidden />
+                                <input type="text" name="pcode" value="{pcode}" hidden />
                                 <input type="number" name="pcount" value="{revert_pcount}" hidden />
                                 <input type="text" name="comment" value="Revert {comment}" hidden />
                                 <input type="submit" class="amount-ntr button" value="Revert" />
@@ -483,7 +497,7 @@ local function r_log(filter)
                         (pcount and tostring(math.abs(pcount)) or ""),
                     comment = escape(comment),
                     revert_amount = -amount,
-                    revert_pcount = -pcount,
+                    revert_pcount = -(pcount or 0),
                 }))
             end
         end
@@ -505,16 +519,18 @@ local function r_index()
         print([[<div class="userlist"></div>]]) -- for printing
         print([[<ul class="userlist">]])
         for _, user in ipairs(get_active_users()) do
-            print(format([[<li>
-                <a href="/{username_url}">
-                    <span class="name">{!username}</span>
-                    {balance}
-                </a>
-            </li>]], {
-                username_url = urlencode(user.username),
-                username = user.username,
-                balance = format_amount(user.balance, "span")
-            }))
+            if user.name.sub(1, 1) ~= "@" then
+                print(format([[<li>
+                    <a href="/{username_url}">
+                        <span class="name">{!username}</span>
+                        {balance}
+                    </a>
+                </li>]], {
+                    username_url = urlencode(user.name),
+                    username = user.name,
+                    balance = format_amount(user.balance, "span")
+                }))
+            end
         end
         print("</ul>")
     end)
@@ -610,7 +626,7 @@ local function r_products()
         </tr>]])
         local pbals = product_balances()
         for barcode, price, user, name in read_products() do
-            print(string.format([[<tr>
+            print(format([[<tr>
                 <td>{!name}</td>
                 {price}
                 <td>{!barcode}</td>
@@ -618,7 +634,7 @@ local function r_products()
                 <td>{!user}</td>
             </tr>]], {
                 name = name,
-                price = format_amount(-price),
+                price = format_amount(-price, "td"),
                 barcode = barcode,
                 count = pbals[barcode] or "0",
                 user = user,