- Merge all V1-V11 migration scripts into one idempotent init.sql
- Simplify ClickHouseSchemaInitializer to load single file
- Replace route_diagrams projection with in-memory caches:
hashCache (routeId+instanceId → contentHash) warm-loaded on startup,
graphCache (contentHash → RouteGraph) lazy-populated on access
- Eliminates 9M+ row scans on diagram lookups
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
