vikingowl c0e678931d feat: add database layer with SQLite and PostgreSQL support ...

Database Package (internal/database/):
- Database interface abstraction for multiple backends
- SQLite implementation with pure Go driver (no CGO)
- PostgreSQL implementation with connection pooling
- Factory pattern for creating database from config
- Tiered retention with automatic aggregation:
  - Raw metrics: 24h (5s resolution)
  - 1-minute aggregation: 7 days
  - 5-minute aggregation: 30 days
  - Hourly aggregation: 1 year

Schema includes:
- agents: registration, status, certificates
- users: local + LDAP authentication
- roles: RBAC with permissions JSON
- sessions: token-based authentication
- metrics_*: time-series with aggregation
- alerts: triggered alerts with acknowledgment

Configuration Updates:
- DatabaseConfig with SQLite path and PostgreSQL settings
- RetentionConfig for customizing data retention
- Environment variables: TYTO_DB_*, TYTO_DB_CONNECTION_STRING
- Default SQLite at /var/lib/tyto/tyto.db

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2025-12-28 08:18:48 +01:00

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