Complete database cleanup and setup automated backups

Phase 1: Historical Trades Cleanup ✅
- Deleted 240 historical trades with NULL profit
- Database now 100% clean: 90 valid trades only
- Backup created before deletion
- Result: 0 NULL profits, 0 unknown sessions

Phase 2: Automated Backup Setup ✅
- Created daily_backup.bat script
- Windows Task Scheduler configured
- Daily backups at 00:00 (midnight)
- 7-day backup rotation
- Next backup: 27.12.2025 00:00:00

Final Database Stats:
- Total Trades: 90 (all valid)
- Win Rate: 67.8% (61 wins / 29 losses)
- Total Profit: $8,305.78
- Profit Factor: 4.19
- Avg Win: $153.58
- Avg Loss: $-36.65

Backups created:
1. backups/trading_bot_before_cleanup_20251226_162438.db
2. backups/trading_bot_before_historical_cleanup_20251226_162934.db
3. backups/trading_bot_daily_20251226.db

All data quality issues resolved!

daily_backup.bat

@@ -0,0 +1,4 @@
+@echo off
+REM Daily Database Backup
+cd /d "C:\Users\Administrator\Documents\Place-Order-Trading-Bot"
+python setup_automated_backup.py --run