diff --git a/plugins/seen.py b/plugins/seen.py
index c893a50..79e1722 100644
--- a/plugins/seen.py
+++ b/plugins/seen.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*- 
+# -*- coding: utf-8 -*-
 """
 IRC Bot Plugin for Tracking User Activity with TinyDB.
 
@@ -20,25 +20,13 @@ import irc3
 from irc3.plugins.command import command
 import ircstyle
 import logging
-import re
-
 
 def truncate(text, length=50):
-    """
-    Truncate text to specified length, appending "..." if truncated.
-    
-    Args:
-        text (str): Input text
-        length (int): Maximum length
-    
-    Returns:
-        str: Truncated text
-    """
+    """Truncate text to specified length, appending "..." if truncated."""
     if not isinstance(text, str):
         text = str(text)
     return text if len(text) <= length else text[:length] + "..."
 
-
 @irc3.plugin
 class UserActivityTracker:
     """IRC bot plugin to track and report user activity using TinyDB."""
@@ -50,45 +38,40 @@ class UserActivityTracker:
         self.User = Query()
         self.log = logging.getLogger(__name__)
 
+    def _add_unique_hostmask(self, nick, hostmask):
+        """Add hostmask to user data if it's not already present and not 'unknown'."""
+        if hostmask == 'unknown':
+            return []
+        
+        user = self.users.get(self.User.nick == nick.lower())
+        if user and 'hostmasks' in user:
+            if hostmask not in user['hostmasks']:
+                user['hostmasks'].append(hostmask)
+            return user['hostmasks']
+        else:
+            return [hostmask]
+
     @irc3.event(r'(?P<mask>\S+)!.* NICK :?(?P<new_nick>\S+)')
     def handle_nick_change(self, mask, new_nick, **kwargs):
-        """Track nickname changes and update the old nickname with the new one."""
-        self.log.debug(f"Received old_nick: {mask.nick}, new_nick: {new_nick}, mask: {mask}, kwargs: {kwargs}")
+        """Track nickname changes."""
         try:
             now = datetime.now().isoformat()
             host = mask.split('!')[1] if '!' in mask else 'unknown'
             
-            # Update the record for the old nickname
-            old_user = self.users.get(self.User.nick == mask.nick)
-            if old_user:
-                # Mark the nickname change in the old user's record
-                old_user_data = {
-                    'last_nick_change': {'old': mask.nick, 'new': new_nick, 'time': now},
-                    'nick': new_nick
-                }
-                self.users.update(old_user_data, self.User.nick == mask.nick)
-            else:
-                # Insert a record for the old nickname if it doesn't exist
-                self.users.insert({
-                    'nick': mask.nick,
-                    'host': host,
-                    'last_nick_change': {'old': mask.nick, 'new': new_nick, 'time': now},
-                    'last_join': None,
-                    'last_message': None
-                })
-            
-            # Update or insert the record for the new nickname
-            new_user = self.users.get(self.User.nick == new_nick)
-            if new_user:
-                self.users.update({'host': host}, self.User.nick == new_nick)
-            else:
-                self.users.insert({
-                    'nick': new_nick,
-                    'host': host,
-                    'last_nick_change': None,
-                    'last_join': None,
-                    'last_message': None
-                })
+            self.users.upsert({
+                'nick': mask.nick.lower(),
+                'hostmasks': self._add_unique_hostmask(mask.nick.lower(), host),
+                'last_nick_change': {'old': mask.nick, 'new': new_nick, 'time': now}
+            }, self.User.nick == mask.nick.lower())
+
+            self.users.upsert({
+                'nick': new_nick.lower(),
+                'hostmasks': self._add_unique_hostmask(new_nick.lower(), host),
+                'last_join': None,
+                'last_message': None,
+                'last_nick_change': {'old': mask.nick, 'new': new_nick, 'time': now}
+            }, self.User.nick == new_nick.lower())
+
         except Exception as e:
             self.log.error(f"Error tracking nick change {mask.nick}→{new_nick}: {e}")
 
@@ -96,43 +79,38 @@ class UserActivityTracker:
     def handle_join(self, mask, channel, **kwargs):
         """Track when users join a channel."""
         try:
-            nick = mask.nick
-            host = mask.host
             now = datetime.now().isoformat()
-            user = self.users.get(self.User.nick == nick)
-            update_data = {'last_join': now, 'host': host}
-            
-            if user:
-                self.users.update(update_data, self.User.nick == nick)
-            else:
-                self.users.insert({'nick': nick, 'host': host, 'last_join': now,
-                                    'last_message': None, 'last_nick_change': None})
+            self.users.upsert({
+                'nick': mask.nick.lower(),
+                'hostmasks': self._add_unique_hostmask(mask.nick.lower(), mask.host),
+                'last_join': now,
+                'last_message': None,
+                'last_nick_change': None
+            }, self.User.nick == mask.nick.lower())
         except Exception as e:
-            self.log.error(f"Error tracking join for {nick}: {e}")
+            self.log.error(f"Error tracking join for {mask.nick}: {e}")
 
     @irc3.event(irc3.rfc.PRIVMSG)
     def handle_message(self, target, data, mask, **kwargs):
         """Track user messages."""
         try:
             now = datetime.now().isoformat()
-            nick = mask.nick  # Get the nickname from the mask
-            host = mask.host  # Get the host from the mask
-            message = {'text': data, 'time': now}
-            self.users.upsert(
-                {'nick': nick, 'host': host, 'last_message': message},
-                self.User.nick == nick
-            )
+            self.users.upsert({
+                'nick': mask.nick.lower(),
+                'hostmasks': self._add_unique_hostmask(mask.nick.lower(), mask.host),
+                'last_message': {'text': data, 'time': now}
+            }, self.User.nick == mask.nick.lower())
         except Exception as e:
-            self.log.error(f"Error tracking message from {nick}: {e}")
+            self.log.error(f"Error tracking message from {mask.nick}: {e}")
 
-    @command(permission=None)
+    @command
     async def seen(self, mask, target, args):
         """Retrieve a user's last activity.
         
         %%seen <nick>
         """
         try:
-            requested_nick = args['<nick>']
+            requested_nick = args['<nick>'].lower()
             user = self.users.get(self.User.nick == requested_nick)
             
             if not user:
@@ -144,35 +122,48 @@ class UserActivityTracker:
             header = ircstyle.style(f"📊 Activity report for {requested_nick}:", fg="blue", bold=True)
             response.append(header)
 
-            # Last join
-            if user.get('last_join'):
-                join_time = datetime.fromisoformat(user['last_join']).strftime('%Y-%m-%d %H:%M:%S')
+            # Hostmasks
+            if 'hostmasks' in user and user['hostmasks']:
+                hostmasks_str = ", ".join(user['hostmasks'])
                 response.append(
-                    ircstyle.style("🕒 Last join: ", fg="cyan") +
-                    ircstyle.style(join_time, fg="white")
+                    ircstyle.style("🌐 Hostmasks: ", fg="cyan") +
+                    ircstyle.style(hostmasks_str, fg="white")
                 )
 
+            # Last join - only if time exists
+            if 'last_join' in user and user['last_join']:
+                try:
+                    join_time = datetime.fromisoformat(user['last_join']).strftime('%Y-%m-%d %H:%M:%S')
+                    response.append(ircstyle.style("🕒 Last join: ", fg="cyan") + ircstyle.style(join_time, fg="white"))
+                except ValueError:
+                    response.append(ircstyle.style("🕒 Last join: ", fg="cyan") + ircstyle.style("Invalid Time Format", fg="white"))
+
             # Last message
-            if user.get('last_message'):
-                msg_time = datetime.fromisoformat(user['last_message']['time']).strftime('%Y-%m-%d %H:%M:%S')
-                msg_text = truncate(user['last_message']['text'])
-                response.append(
-                    ircstyle.style("💬 Last message: ", fg="green") +
-                    ircstyle.style(f"[{msg_time}] ", fg="grey") +
-                    ircstyle.style(msg_text, fg="white", italics=True)
-                )
+            if 'last_message' in user and user['last_message']:
+                try:
+                    msg_time = datetime.fromisoformat(user['last_message']['time']).strftime('%Y-%m-%d %H:%M:%S')
+                    msg_text = truncate(user['last_message']['text'])
+                    response.append(
+                        ircstyle.style("💬 Last message: ", fg="green") +
+                        ircstyle.style(f"[{msg_time}] ", fg="grey") +
+                        ircstyle.style(msg_text, fg="white", italics=True)
+                    )
+                except (ValueError, KeyError):
+                    response.append(ircstyle.style("💬 Last message: ", fg="green") + ircstyle.style("Invalid or Missing Data", fg="white"))
 
             # Last nick change
-            if user.get('last_nick_change'):
-                old_nick = user['last_nick_change']['old']
-                new_nick = user['last_nick_change']['new']
-                change_time = datetime.fromisoformat(user['last_nick_change']['time']).strftime('%Y-%m-%d %H:%M:%S')
-                response.append(
-                    ircstyle.style(f"📛 Nickname change: ", fg="purple") +
-                    ircstyle.style(f"Changed from {old_nick} to {new_nick} at {change_time}", fg="white")
-                )
+            if 'last_nick_change' in user and user['last_nick_change']:
+                try:
+                    change_time = datetime.fromisoformat(user['last_nick_change']['time']).strftime('%Y-%m-%d %H:%M:%S')
+                    old_nick = user['last_nick_change']['old']
+                    new_nick = user['last_nick_change']['new']
+                    response.append(
+                        ircstyle.style(f"📛 Nickname change: ", fg="purple") +
+                        ircstyle.style(f"Changed from {old_nick} to {new_nick} at {change_time}", fg="white")
+                    )
+                except (ValueError, KeyError):
+                    response.append(ircstyle.style(f"📛 Nickname change: ", fg="purple") + ircstyle.style("Invalid or Missing Data", fg="white"))
 
-            # Handle no tracked activity
             if len(response) == 1:  # Only header present
                 response.append(ircstyle.style("No tracked activities.", fg="yellow"))
 
@@ -181,7 +172,4 @@ class UserActivityTracker:
 
         except Exception as e:
             self.log.error(f"Error in !seen command: {e}")
-            self.bot.privmsg(
-                target,
-                ircstyle.style("❌ Internal error processing request.", fg="red", bold=True)
-            )
+            self.bot.privmsg(target, ircstyle.style("❌ Internal error processing request.", fg="red", bold=True))
\ No newline at end of file