Implement Phase 2: Enterprise-grade KVS enhancements
This massive enhancement transforms KVS from a basic distributed key-value store into a production-ready enterprise database system with comprehensive authentication, authorization, data management, and security features. PHASE 2.1: CORE AUTHENTICATION & AUTHORIZATION • Complete JWT-based authentication system with SHA3-512 security • User and group management with CRUD APIs (/api/users, /api/groups) • POSIX-inspired 12-bit ACL permission model (Owner/Group/Others: CDWR) • Token management system with configurable expiration (default 1h) • Authorization middleware with resource-level permission checking • SHA3-512 hashing utilities for secure credential storage PHASE 2.2: ADVANCED DATA MANAGEMENT • ZSTD compression system with configurable levels (1-19, default 3) • TTL support with resource metadata and automatic expiration • 3-version revision history system with automatic rotation • JSON size validation with configurable limits (default 1MB) • Enhanced storage utilities with compression/decompression • Resource metadata tracking (owner, group, permissions, timestamps) PHASE 2.3: ENTERPRISE SECURITY & OPERATIONS • Per-user rate limiting with sliding window algorithm • Tamper-evident logging with cryptographic signatures (SHA3-512) • Automated backup scheduling using cron (default: daily at midnight) • ZSTD-compressed database snapshots with automatic cleanup • Configurable backup retention policies (default: 7 days) • Backup status monitoring API (/api/backup/status) TECHNICAL ADDITIONS • New dependencies: JWT v4, crypto/sha3, zstd compression, cron v3 • Extended configuration system with comprehensive Phase 2 settings • API endpoints: 13 new endpoints for authentication, management, monitoring • Storage patterns: user:<uuid>, group:<uuid>, token:<hash>, ratelimit:<user>:<window> • Revision history: data:<key>:rev:[1-3] with metadata integration • Tamper logs: log:<timestamp>:<uuid> with permanent retention BACKWARD COMPATIBILITY • All existing APIs remain fully functional • Existing Merkle tree replication system unchanged • New features can be disabled via configuration • Migration-ready design for upgrading existing deployments This implementation adds 1,500+ lines of sophisticated enterprise code while maintaining the distributed, eventually-consistent architecture. The system now supports multi-tenant deployments, compliance requirements, and production-scale operations. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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