odstranenie priemernej dlzky hry zo statistik

api/stats.py

@@ -240,14 +240,6 @@ async def get_daily_stats(logged_in_only: bool = False) -> dict:
             )
         ).one()
 
-        avg_duration = (
-            await session.execute(
-                select(func.avg(func.extract("epoch", Game.ended_at - Game.created_at))).where(
-                    Game.ended_at.is_not(None)
-                )
-            )
-        ).scalar()
-
         # Nedokoncena registracia = kod nebol nikdy potvrdeny (SQL obdoba
         # api/auth._is_unconfirmed). "Hraci celkom" pocita len potvrdene ucty,
         # nedokoncene sa vykazuju osobitne.
@@ -338,7 +330,6 @@ async def get_daily_stats(logged_in_only: bool = False) -> dict:
         "players_per_day": {str(r.day): r.n for r in player_rows},
         "finished_bot_games": finished_bot_games,
         "finished_human_games": finished_human_games,
-        "avg_game_duration_minutes": (float(avg_duration) / 60) if avg_duration else None,
         "total_players": total_players,
         "unconfirmed_players": unconfirmed_players,
         "peak_hours": {int(r.h): r.n for r in peak_hours},