docs: Release Notes on BZOD v0.5.0 — General Availability

docs/RELEASE-NOTES.md

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+# BZOD v0.5.0 — General Availability
+
+**Release Date:** 2026-06-19
+
+**BZOD v0.5.0** is the largest release in project history and marks the transition from a single-user URL shortener into a **production-ready multi-user platform** with tenant isolation, administration tools, analytics, moderation, backups, auditing, and comprehensive validation coverage.
+
+## Key Highlights
+
+- **Multi-User Architecture** with strong tenant isolation
+- **Global Slug Namespace** with ownership tracking
+- **New Administration Portal** for user management and moderation
+- **User Self-Service Portal** with dedicated dashboards
+- **Enhanced Analytics** with per-user and platform-wide views
+- **Comprehensive Backup & Recovery** tooling
+- **Upgrade Framework** with automated migration validation
+- **90+ Automated Tests** covering multi-user scenarios, upgrades, and disaster recovery
+
+---
+
+## Multi-User Architecture
+
+BZOD now supports multiple isolated users on a single deployment.
+
+**Key capabilities:**
+- Per-user content and analytics databases
+- User quotas and status management
+- User sessions and API tokens
+- Strong tenant isolation enforcement
+
+Each user's data is strictly separated.
+
+## Administration Portal
+
+New administrative dashboards include:
+
+**User Management**
+- Create, delete, enable, disable users
+- Password resets and quota management
+
+**Moderation Tools**
+- Flag, disable, or re-enable content
+- Moderation history
+
+**Session & Audit Management**
+- View and revoke sessions
+- Full audit viewer
+
+**Backup Management**
+- Create, restore, and download backups
+
+## User Self-Service Portal
+
+Standard users now have dedicated dashboards for:
+- Profile & password management
+- Link and landing page management
+- QR code generation
+- Personal analytics
+- API token management
+
+## Security & Reliability
+
+- Improved authentication and authorization
+- Enhanced CSRF, SQL injection, and path traversal protection
+- SQLite WAL mode with better transaction handling
+- Comprehensive backup & recovery with rollback protection
+
+## Testing & Validation
+
+**Passed:**
+- 90+ automated tests
+- Full multi-user validation
+- Upgrade path verification
+- Backup/Restore + Disaster recovery tests
+- Security regression tests
+- Concurrency and WAL recovery tests
+
+## Breaking Changes
+
+The internal storage model has changed significantly to support multi-user operation.
+
+**Administrators upgrading from v0.4.x should review:**
+- `UPGRADE.md`
+- `MULTI_USER.md`
+- `BACKUP_RESTORE.md`
+
+---
+
+## Get Started
+
+**One-command installation:**
+
+```bash
+curl -fsSL https://bzo.in/deploy.sh | sudo bash