docs: add DOCKER_GUIDE.md and fix .env parsing; chore: update docker and script configurations

scripts/backup.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+# Backup script for Synology DS218+
+# Run via Task Scheduler every 6 hours
+
+BACKUP_DIR="/volume1/btc_bot/backups"
+DB_NAME="btc_data"
+DB_USER="btc_bot"
+RETENTION_DAYS=30
+DATE=$(date +%Y%m%d_%H%M)
+
+echo "Starting backup at $(date)"
+
+# Create backup directory if not exists
+mkdir -p $BACKUP_DIR
+
+# Create backup
+docker exec btc_timescale pg_dump -U $DB_USER -Fc $DB_NAME > $BACKUP_DIR/btc_data_$DATE.dump
+
+# Compress
+if [ -f "$BACKUP_DIR/btc_data_$DATE.dump" ]; then
+    gzip $BACKUP_DIR/btc_data_$DATE.dump
+    echo "Backup created: btc_data_$DATE.dump.gz"
+    
+    # Calculate size
+    SIZE=$(du -h $BACKUP_DIR/btc_data_$DATE.dump.gz | cut -f1)
+    echo "Backup size: $SIZE"
+else
+    echo "Error: Backup file not created"
+    exit 1
+fi
+
+# Delete old backups
+DELETED=$(find $BACKUP_DIR -name "*.dump.gz" -mtime +$RETENTION_DAYS | wc -l)
+find $BACKUP_DIR -name "*.dump.gz" -mtime +$RETENTION_DAYS -delete
+
+echo "Deleted $DELETED old backup(s)"
+echo "Backup completed at $(date)"