update .env.example with balance stuff

src/.env.example

@@ -317,9 +317,37 @@ PORT=3000
 # Default: alerts@monerogue.app
 # ALERT_FROM_EMAIL=noreply@yourdomain.com
 
-# Low balance threshold in atomic units (triggers email alert)
-# Default: 100000000000 (0.1 XMR/WOW)
-LOW_BALANCE_THRESHOLD=100000000000
+# -------------------------
+# BALANCE THRESHOLDS
+# -------------------------
+# Two-tier alert system for wallet balance monitoring:
+#
+# BALANCE_WARN: Sends email alert when balance drops below this level
+#               You should top up the wallet soon.
+#
+# BALANCE_CRITICAL: Sends email AND HALTS NEW GAMES when balance drops below
+#                   Users will see a modal: "Sorry, the house balance is too low..."
+#                   Games resume automatically when balance is restored above this threshold.
+#
+# All values in atomic units:
+#   WOW: 1 WOW = 100000000000 (10^11)
+#   XMR: 1 XMR = 1000000000000 (10^12)
+
+# Warning threshold - sends email alert (default: 0.1 WOW/XMR)
+BALANCE_WARN=100000000000
+
+# Critical threshold - halts new games (default: 0.01 WOW/XMR)
+BALANCE_CRITICAL=10000000000
+
+# Legacy alias (superseded by BALANCE_WARN, kept for backwards compatibility)
+# LOW_BALANCE_THRESHOLD=100000000000
+
+# -------------------------
+# OTHER ALERT SETTINGS
+# -------------------------
+
+# Alert when pending/failed payouts exceed this count
+HIGH_PENDING_THRESHOLD=10
 
 # Alert cooldown in milliseconds (avoid spam)
 # Default: 3600000 (1 hour)