Change exp leveling system

commands/dev_member_commands.py

@@ -9,7 +9,7 @@ from discord import app_commands
 
 from core import sheets
 import strings as S
-from core.member_sync import announce_birthday, sync_member
+from core.member_sync import announce_birthday, sync_member, today_local
 
 
 class BirthdayPages(discord.ui.View):
@@ -44,7 +44,7 @@ def _build_birthday_pages(
     Returns (pages, start_index) where start_index is the current month.
     """
     rows = sheets.get_cache()
-    today = datetime.date.today()
+    today = today_local()
 
     by_month: dict[int, list[tuple[int, str, int | None]]] = {m: [] for m in range(1, 13)}
 
@@ -298,8 +298,8 @@ def register_dev_member_commands(
             for fmt in ["%d/%m/%Y", "%Y-%m-%d"]:
                 try:
                     bday = datetime.datetime.strptime(bday_str, fmt).date()
-                    if 1920 <= bday.year <= datetime.date.today().year:
-                        today = datetime.date.today()
+                    if 1920 <= bday.year <= today_local().year:
+                        today = today_local()
                         age = today.year - bday.year - ((today.month, today.day) < (bday.month, bday.day))
                         embed.add_field(name=S.MEMBER_UI["age_field"], value=S.MEMBER_UI["age_val"].format(age=age), inline=True)
                     break

core/economy.py

@@ -317,16 +317,18 @@ LEVEL_ROLES: list[tuple[int, str]] = [
 
 
 def get_level(exp: int) -> int:
-    """Level = max(1, floor(sqrt(exp/6))).
-    Level 5 @ 150 EXP, 10 @ 600, 20 @ 2400, 30 @ 5400."""
-    return max(1, int(math.sqrt(max(0, exp) / 6)))
+    """Level = max(1, floor(sqrt(exp/10))).
+    Level 5 @ 250 EXP, 10 @ 1000, 20 @ 4000, 30 @ 9000."""
+    return max(1, int(math.sqrt(max(0, exp) / 10)))
 
 
 def exp_for_level(level: int) -> int:
-    """Minimum cumulative EXP to reach this level. level^2 * 6."""
+    """Minimum cumulative EXP to reach this level.
+    Recurrence: exp_for_level(L) = L*20 - 10 + exp_for_level(L-1), base 0.
+    Closed form: 10*level^2."""
     if level <= 1:
         return 0
-    return level * level * 6
+    return 10 * level * level
 
 
 def level_role_name(level: int) -> str:

core/member_sync.py

@@ -2,9 +2,11 @@
 
 from __future__ import annotations
 
+import calendar
 import logging
 from datetime import datetime, date
 from dataclasses import dataclass, field
+from zoneinfo import ZoneInfo
 
 import discord
 
@@ -13,6 +15,20 @@ from . import sheets
 
 log = logging.getLogger(__name__)
 _PLACEHOLDER = {"-", "x", "n/a", "none", "ei"}
+_TZ = ZoneInfo("Europe/Tallinn")
+
+
+def today_local() -> date:
+    """Today's date in Europe/Tallinn — the bot's operational timezone, independent of host TZ."""
+    return datetime.now(_TZ).date()
+
+
+def _shift_year_safe(d: date, year: int) -> date:
+    """Move `d` to `year`; Feb 29 falls back to Feb 28 when the target year is non-leap."""
+    try:
+        return d.replace(year=year)
+    except ValueError:
+        return d.replace(year=year, day=28)
 
 
 def _is_placeholder(val: str) -> bool:
@@ -72,7 +88,7 @@ def _parse_birthday(raw: str) -> date | None:
     raw = str(raw).strip()
     if _is_placeholder(raw):
         return None
-    today = date.today()
+    today = today_local()
     for fmt, has_year in [("%d/%m/%Y", True), ("%Y-%m-%d", True), ("%m-%d", False)]:
         try:
             parsed = datetime.strptime(raw, fmt).date()
@@ -90,21 +106,32 @@ def _is_birthday_soon(birthday_str: str, window_days: int | None = None) -> bool
     if bday is None:
         return False
     window = window_days or config.BIRTHDAY_WINDOW_DAYS
-    today = date.today()
-    this_year_bday = bday.replace(year=today.year)
+    today = today_local()
+    this_year_bday = _shift_year_safe(bday, today.year)
     if this_year_bday < today:
-        this_year_bday = bday.replace(year=today.year + 1)
+        this_year_bday = _shift_year_safe(bday, today.year + 1)
     delta = (this_year_bday - today).days
     return 0 <= delta <= window
 
 
 def is_birthday_today(birthday_str: str) -> bool:
-    """Return True if today is the member's birthday (any supported date format)."""
+    """Return True if today is the member's birthday (any supported date format).
+
+    Feb 29 babies are observed on Feb 28 in non-leap years.
+    """
     bday = _parse_birthday(birthday_str)
     if bday is None:
         return False
-    today = date.today()
-    return bday.month == today.month and bday.day == today.day
+    today = today_local()
+    if bday.month == today.month and bday.day == today.day:
+        return True
+    if (
+        bday.month == 2 and bday.day == 29
+        and today.month == 2 and today.day == 28
+        and not calendar.isleap(today.year)
+    ):
+        return True
+    return False
 
 
 async def sync_member(