semi implemented and features implemented save checkpoint

docs/features/unchecked/concelier/canonical-advisory-source-edge-schema.md

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+# Canonical Advisory Source Edge Schema (Database Layer)
+
+## Module
+Concelier
+
+## Status
+IMPLEMENTED
+
+## Description
+Database schema for provenance-scoped canonical advisory deduplication. Stores deduplicated advisories with merge_hash identity and links each to source documents via DSSE-signed source edges. Enables multi-source advisory merge with full provenance tracking.
+
+## Implementation Details
+- **Modules**: `src/Concelier/__Libraries/StellaOps.Concelier.Persistence/`, `src/Concelier/__Libraries/StellaOps.Concelier.Merge/`
+- **Key Classes**:
+  - `AdvisorySourceEdgeEntity` (`src/Concelier/__Libraries/StellaOps.Concelier.Persistence/Postgres/Models/AdvisorySourceEdgeEntity.cs`) - database entity linking canonical advisories to source documents
+  - `AdvisoryCanonicalRepository` (`src/Concelier/__Libraries/StellaOps.Concelier.Persistence/Postgres/Repositories/AdvisoryCanonicalRepository.cs`) - canonical advisory CRUD with merge_hash identity
+  - `AdvisoryRepository` (`src/Concelier/__Libraries/StellaOps.Concelier.Persistence/Postgres/Repositories/AdvisoryRepository.cs`) - raw advisory persistence
+  - `MergeHashCalculator` (`src/Concelier/__Libraries/StellaOps.Concelier.Merge/Identity/MergeHashCalculator.cs`) - deterministic merge hash for deduplication identity
+  - `ConcelierDbContext` (`src/Concelier/__Libraries/StellaOps.Concelier.Persistence/EfCore/Context/ConcelierDbContext.cs`) - EF Core context with source edge schema
+  - `ConcelierDataSource` (`src/Concelier/__Libraries/StellaOps.Concelier.Persistence/Postgres/ConcelierDataSource.cs`) - PostgreSQL data source configuration
+- **Source**: SPRINT_8200_0012_0002_DB_canonical_source_edge_schema.md
+
+## E2E Test Plan
+- [ ] Insert a canonical advisory with merge_hash and verify it persists in PostgreSQL via `AdvisoryCanonicalRepository`
+- [ ] Insert two source edges linking different raw advisories to the same canonical and verify both edges are retrievable
+- [ ] Verify merge_hash uniqueness: attempting to insert a duplicate merge_hash updates the existing canonical rather than creating a new one
+- [ ] Verify source edge provenance: query a canonical and verify all linked source documents are returned with provenance metadata
+- [ ] Verify schema migration applies cleanly on a fresh database