- Add identifier validation for database names in PostgreSQL and MySQL
- validateIdentifier() rejects names with invalid characters
- quoteIdentifier() safely quotes identifiers with proper escaping
- Max length: 63 chars (PostgreSQL), 64 chars (MySQL)
- Only allows alphanumeric + underscores, must start with letter/underscore
- Fix data race in notification manager
- Multiple goroutines were appending to shared error slice
- Added errMu sync.Mutex to protect concurrent error collection
- Security improvements prevent:
- SQL injection via malicious database names
- CREATE DATABASE `foo`; DROP DATABASE production; --`
- Race conditions causing lost or corrupted error data
- Add --dry-run/-n flag for backup commands with comprehensive preflight checks
- Database connectivity validation
- Required tools availability check
- Storage target and permissions verification
- Backup size estimation
- Encryption and cloud storage configuration validation
- Implement GFS (Grandfather-Father-Son) retention policies
- Daily/Weekly/Monthly/Yearly tier classification
- Configurable retention counts per tier
- Custom weekly day and monthly day settings
- ISO week handling for proper week boundaries
- Add notification system with SMTP and webhook support
- SMTP email notifications with TLS/STARTTLS
- Webhook HTTP notifications with HMAC-SHA256 signing
- Slack-compatible webhook payload format
- Event types: backup/restore started/completed/failed, cleanup, verify, PITR
- Configurable severity levels and retry logic
- Update README.md with documentation for all new features
