diff --git a/PresenceTracker.py b/PresenceTracker.py
new file mode 100644
index 0000000..9aea581
--- /dev/null
+++ b/PresenceTracker.py
@@ -0,0 +1,118 @@
+import sqlite3
+from datetime import datetime
+from loguru import logger
+from datetime_utils import to_unix
+
+
+def get_db() -> sqlite3.Connection:
+    SCHEMA = """
+    create table if not exists activities (
+        id integer primary key autoincrement,
+        name text not null unique
+    );
+    
+    create table if not exists users_cache (
+        user_id integer primary key,
+        nickname text not null
+    );
+    
+    create table if not exists presence_journal (
+        user_id integer not null,
+        start_time integer not null,  -- In unix timestamp
+        end_time integer not null,
+        activity_name_id integer not null,
+        primary key (user_id, start_time),
+        foreign key (activity_name_id) references activities(id)
+    );"""
+
+    db = sqlite3.connect('presence-tracker.sqlite')
+    db.executescript(SCHEMA)
+    return db
+
+
+class PresenceTracker:
+    def __init__(self, db: sqlite3.Connection = get_db()):
+        self.db = db
+
+    def log_activity(self, user_id: int, activity_name: str, start_time: datetime, end_time: datetime | None = None):
+        """Create record or update uncommited end_time"""
+
+        # end_time behaves like "last seen with this activity"
+
+        logger.info(f'Logging {user_id=}, {activity_name=}, {start_time.isoformat()=}, {end_time=}')
+
+        activity_id = self.get_activity_id(activity_name)
+        _end_time = self.to_unix_default(end_time)  # Defaulted end_time
+
+        unix_start_time = to_unix(start_time)
+
+        if unix_start_time > _end_time:
+            logger.warning(f'Got {unix_start_time=} > {_end_time}, {_end_time - unix_start_time=}, {user_id=}, {activity_name=}')
+
+
+        with self.db:
+            self.db.execute(
+                    """insert into presence_journal (user_id, start_time, activity_name_id, end_time) 
+                        values (:user_id, :start_time, :activity_name_id, :end_time) 
+                    on conflict do update set end_time = :end_time;""",
+                {
+                    'user_id': user_id,
+                    'start_time': to_unix(start_time),
+                    'activity_name_id': activity_id,
+                    'end_time': _end_time
+                }
+            )
+
+    def get_activity_id(self, activity_name: str) -> int:
+        # Try to find first, insert after
+        params = (activity_name,)
+        query = self.db.execute('select id from activities where name = ?;', params).fetchone()
+        if query is not None:
+            logger.trace(f'Found record for {activity_name!r} id={query}')
+            return query[0]
+
+        with self.db:
+            query = self.db.execute('insert into activities (name) values (?) returning id;', params).fetchone()
+
+        logger.debug(f'Inserted record for {activity_name!r} {query}')
+        return query[0]
+
+    def saturate_users_cache(self, user_id: int, user_name: str):
+        logger.trace(f'Adding {user_name!r} to cache')
+        with self.db:
+            self.db.execute(
+                'insert or ignore into users_cache (user_id, nickname) VALUES (?, ?);',
+                (user_id, user_name)
+            )
+
+    def user_breakdown(self, user_id: int) -> dict[str, int]:
+        """Return dict with activities names as keys and spent time in seconds as values"""
+        res = self.db.execute(
+            'select a.name, round(sum(end_time - start_time) / 3600.0, 1) as total '
+            'from presence_journal '
+            'left join activities a on a.id = presence_journal.activity_name_id '
+            'where user_id = ? '
+            'group by activity_name_id '
+            'order by total desc;',
+            (user_id,)
+        ).fetchall()
+
+        return {row[0]: row[1] for row in res}
+
+    def top_users(self, last_days: int | None) -> dict[int, tuple[str | None, int]]:
+        """Returns keys - ids, values - tuple(nickname?, seconds spent)"""  # TODO: implement last_days
+        res = self.db.execute(
+            """select uc.user_id, uc.nickname, round(sum(end_time - presence_journal.start_time) / 3600.0, 1) as total
+            from presence_journal left join users_cache uc on presence_journal.user_id = uc.user_id
+            group by uc.user_id
+            order by total desc
+            limit 50;""").fetchall()
+
+        return {row[0]: row[1:3] for row in res}
+
+    @staticmethod
+    def default_end_time(end_time: datetime | None) -> datetime:
+        return datetime.now() if end_time is None else end_time
+
+    def to_unix_default(self, end_time: datetime | None) -> int:
+        return to_unix(self.default_end_time(end_time))
diff --git a/datetime_utils.py b/datetime_utils.py
new file mode 100644
index 0000000..40632bd
--- /dev/null
+++ b/datetime_utils.py
@@ -0,0 +1,6 @@
+from datetime import datetime
+
+def to_unix(timestamp: datetime) -> int:
+    """Convert datetime.datetime to unix timestamp as int (since we store all timestamps in unix format in DB"""
+    return int(datetime.timestamp(timestamp))
+
diff --git a/extensions/Frontend.py b/extensions/Frontend.py
new file mode 100644
index 0000000..6825a31
--- /dev/null
+++ b/extensions/Frontend.py
@@ -0,0 +1,77 @@
+from typing import TYPE_CHECKING, Sequence
+
+import discord
+import discord.ext.commands as commands
+from loguru import logger
+
+
+if TYPE_CHECKING:
+    from main import Bot
+
+
+def build_table_embed(*columns: Sequence[object], name: str, description: str, **kwargs) -> discord.Embed:
+    """First value of one column is a header"""
+
+    embed = discord.Embed(
+        title=name,
+        description=description,
+        **kwargs
+    )
+
+    for column in columns:
+        column_iter = iter(column)
+        embed.add_field(name=next(column_iter), value='\n'.join(str(cell) for cell in column_iter), inline=True)
+
+    return embed
+
+
+class Frontend(commands.Cog):
+    def __init__(self, bot: 'Bot'):
+        self.bot = bot
+
+    @discord.app_commands.command()
+    async def stats(self, interaction: discord.Interaction, user: discord.User | None):
+        """
+        Show how many hours a user spent in games per game (default - You)
+
+        :param interaction:
+        :param user: User for who we will get stats, You by default
+        """
+
+        _user = interaction.user if user is None else user
+
+        logger.trace(f'Starting my_stats for {_user}')
+        stats: dict[str, int] = self.bot.activity_tracker.user_breakdown(_user.id)
+        embed = build_table_embed(
+            ('Games', *stats.keys()),
+            ('Hours spent', *stats.values()),
+            name=f'Gaming stats for {str(_user)}',
+            description=f'Totally played {sum(stats.values())} hours'
+        )
+        await interaction.response.send_message(embed=embed)
+
+    @discord.app_commands.command()
+    async def top_users(
+            self,
+            interaction: discord.Interaction
+            # ,last_days_count: discord.app_commands.Range[int, 1, None]
+    ):
+        """
+        Show top of players by spent in games hours
+
+        :param interaction:
+        :param last_days_count: Show stats for last number of days, i.e. for last 14 days (all time for default)
+        :return:
+        """
+        data = self.bot.activity_tracker.top_users(0)
+        embed = build_table_embed(
+            ('Username', *(value[0] for value in data.values())),
+            ('Spent hours', *(value[1] for value in data.values())),
+            name='Top users by spent in games',
+            description='Limited up to 50 entries'
+        )
+        await interaction.response.send_message(embed=embed)
+
+
+async def setup(bot: 'Bot'):
+    await bot.add_cog(Frontend(bot))
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..31683ba
--- /dev/null
+++ b/main.py
@@ -0,0 +1,122 @@
+import asyncio
+import os
+import signal
+import logging
+import sys
+from typing import Any
+from itertools import chain
+
+from loguru import logger
+from PresenceTracker import PresenceTracker
+import discord
+from discord.ext.commands import Bot as BotBase
+from pathlib import Path
+
+"""
+Cases should be considered:
+Case 1 None -> Playing
+Case 2 Playing -> None
+Case 3 Playing -> bot shutdown -> Already stopped playing (just commit last end_time?)
+Case 4 None -> bot shutdown -> Already playing (catch on stop playing, so Case 2)
+Case 5 Playing -> Gone invisible -> Gone visible with the same activity (handles by Case 1 and Case 2)
+Case 6: Playing -> Still playing (for end_time updating)
+
+TODO: Handle negative diff 
+"""
+
+
+class InterceptHandler(logging.Handler):
+    def emit(self, record):
+        # Get corresponding Loguru level if it exists
+        try:
+            level = logger.level(record.levelname).name
+        except ValueError:
+            level = record.levelno
+
+        # Find caller from where originated the logged message
+        frame, depth = logging.currentframe(), 2
+        while frame.f_code.co_filename == logging.__file__:
+            frame = frame.f_back
+            depth += 1
+
+        logger.opt(depth=depth, exception=record.exc_info).log(level, record.getMessage())
+
+logging.basicConfig(handlers=[InterceptHandler()], level=logging.INFO)
+
+
+class Bot(BotBase):
+    def __init__(self, *, intents: discord.Intents, activity_tracker: PresenceTracker, **options: Any):
+        super().__init__(intents=intents, **options)
+        self.activity_tracker = activity_tracker
+
+    async def setup_hook(self) -> None:
+        logger.info(f'Invite URL: {"No self.user" if self.user is None else discord.utils.oauth_url(self.user.id)}')
+
+        for filepath in Path('extensions').glob('*.py'):
+            filename = filepath.name
+            logger.info(f'Loading extension {filename}')
+            await self.load_extension(f"extensions.{filename[:-3]}")
+
+        # self.tree.clear_commands(guild=discord.Object(648268554386407432))
+        # await self.tree.sync(guild=discord.Object(648268554386407432))
+        #
+        # self.tree.copy_global_to(guild=discord.Object(648268554386407432))
+        # await self.tree.sync(guild=discord.Object(648268554386407432))
+
+        # await self.tree.sync()
+
+
+    def signal_handler(self, signame, _):
+        logger.info(f'Got {signame} signal, shutting down')
+        self.loop.create_task(self.close())
+
+    async def on_ready(self):
+        logger.info(f'Ready {self.user}')
+
+    async def on_presence_update(self, before: discord.Member, after: discord.Member):
+        if before.bot:
+            return
+
+        for activity in chain(before.activities, after.activities):
+            if activity.type == discord.ActivityType.playing:
+                if isinstance(activity, (discord.Game, discord.Activity)):
+                    if activity.name is not None and activity.start is not None:
+                        self.activity_tracker.log_activity(after.id, activity.name, activity.start, activity.end)
+                        self.activity_tracker.saturate_users_cache(after.id, after.name + '#' + after.discriminator)
+
+                    else:
+                        logger.warning(f'Got activity with missing name or start: {activity.to_dict()!r}')
+
+                else:
+                    logger.warning(
+                        f'Got discord.ActivityType.playing with unusual type: {type(activity)}; {activity.to_dict()}')
+
+            else:
+                logger.trace(f'Got not playing activity: {activity.to_dict()}')
+
+
+async def async_main():
+    # logger.disable('discord')
+    logger.remove()
+    logger.add(sink=sys.stderr, level='TRACE')
+
+    intents = discord.Intents.default()
+    intents.presences = True
+    intents.members = True
+
+    activity_tracker = PresenceTracker()
+    bot = Bot(intents=intents, activity_tracker=activity_tracker, command_prefix='')
+
+    for sig in (signal.SIGTERM, signal.SIGINT):
+        signal.signal(sig, bot.signal_handler)
+
+    await bot.start(os.environ['TOKEN'])
+
+
+def main():
+    loop = asyncio.new_event_loop()
+    loop.run_until_complete(async_main())
+
+
+if __name__ == '__main__':
+    main()
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..fb21c91
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,2 @@
+discord==2.0.0
+loguru==0.6.0