#!/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)"