feat(database): create all core tables with migrations
Add database migrations for mockupAWS v0.2.0:
- DB-003: scenario_logs table
* Stores received log entries with SHA256 hash for deduplication
* PII detection flags
* Metrics: size_bytes, token_count, sqs_blocks
* Indexes on scenario_id, received_at, message_hash, has_pii
- DB-004: scenario_metrics table
* Time-series storage for metrics aggregation
* Supports: sqs, lambda, bedrock, safety metric types
* Flexible JSONB metadata field
* BRIN index on timestamp for efficient queries
- DB-005: aws_pricing table
* Stores AWS service pricing by region
* Supports price history with effective_from/to dates
* Active pricing flag for current rates
* Index on service, region, tier combination
- DB-006: reports table
* Generated report tracking
* Supports PDF and CSV formats
* File path and size tracking
* Metadata JSONB for extensibility
All tables include:
- UUID primary keys with auto-generation
- Foreign key constraints with CASCADE delete
- Appropriate indexes for query performance
- Check constraints for data validation
Tasks: DB-003, DB-004, DB-005, DB-006 complete
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