GraphRAG inclusiv LINQ extnsions

Author: MPCoreDeveloper

DELIVERY_COMPLETE.md

@@ -73,6 +73,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SharpCoreDB.VectorSearch",
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SharpCoreDB.VectorSearch.Tests", "tests\SharpCoreDB.VectorSearch.Tests\SharpCoreDB.VectorSearch.Tests.csproj", "{A55A128B-6E04-4FC5-A3FF-6F05F111FECA}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SharpCoreDB.Graph", "src\SharpCoreDB.Graph\SharpCoreDB.Graph.csproj", "{2EC01CCD-F0B2-8532-CA9A-39C43D04299C}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -299,6 +301,18 @@ Global
 		{A55A128B-6E04-4FC5-A3FF-6F05F111FECA}.Release|x64.Build.0 = Release|Any CPU
 		{A55A128B-6E04-4FC5-A3FF-6F05F111FECA}.Release|x86.ActiveCfg = Release|Any CPU
 		{A55A128B-6E04-4FC5-A3FF-6F05F111FECA}.Release|x86.Build.0 = Release|Any CPU
+		{2EC01CCD-F0B2-8532-CA9A-39C43D04299C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{2EC01CCD-F0B2-8532-CA9A-39C43D04299C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{2EC01CCD-F0B2-8532-CA9A-39C43D04299C}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{2EC01CCD-F0B2-8532-CA9A-39C43D04299C}.Debug|x64.Build.0 = Debug|Any CPU
+		{2EC01CCD-F0B2-8532-CA9A-39C43D04299C}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{2EC01CCD-F0B2-8532-CA9A-39C43D04299C}.Debug|x86.Build.0 = Debug|Any CPU
+		{2EC01CCD-F0B2-8532-CA9A-39C43D04299C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{2EC01CCD-F0B2-8532-CA9A-39C43D04299C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{2EC01CCD-F0B2-8532-CA9A-39C43D04299C}.Release|x64.ActiveCfg = Release|Any CPU
+		{2EC01CCD-F0B2-8532-CA9A-39C43D04299C}.Release|x64.Build.0 = Release|Any CPU
+		{2EC01CCD-F0B2-8532-CA9A-39C43D04299C}.Release|x86.ActiveCfg = Release|Any CPU
+		{2EC01CCD-F0B2-8532-CA9A-39C43D04299C}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -328,6 +342,7 @@ Global
 		{800EBE19-FE8B-EBD4-D5F7-AFB27C1755A0} = {A1B2C3D4-E5F6-4A7B-8C9D-0E1F2A3B4C5D}
 		{5E39577A-E286-45E9-9801-E8DC8F81ED7D} = {F8B5E3A4-1C2D-4E5F-8B9A-1D2E3F4A5B6C}
 		{A55A128B-6E04-4FC5-A3FF-6F05F111FECA} = {A1B2C3D4-E5F6-4A7B-8C9D-0E1F2A3B4C5D}
+		{2EC01CCD-F0B2-8532-CA9A-39C43D04299C} = {F8B5E3A4-1C2D-4E5F-8B9A-1D2E3F4A5B6C}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {F40825F5-26A1-4E85-9D0A-B0121A7ED5F8}

README_DELIVERY.md

@@ -23,12 +23,13 @@ This is your central guide to all SharpCoreDB features, guides, and resources.
 ## 📋 Table of Contents
 
 1. [Vector Search](#vector-search)
-2. [Collation Support](#collations)
-3. [Features & Phases](#features--phases)
-4. [Migration Guides](#migration-guides)
-5. [API & Configuration](#api--configuration)
-6. [Performance & Tuning](#performance--tuning)
-7. [Support & Community](#support--community)
+2. [GraphRAG — Lightweight Graph Capabilities](#graphrag--lightweight-graph-capabilities)
+3. [Collation Support](#collations)
+4. [Features & Phases](#features--phases)
+5. [Migration Guides](#migration-guides)
+6. [API & Configuration](#api--configuration)
+7. [Performance & Tuning](#performance--tuning)
+8. [Support & Community](#support--community)
 
 ---
 
@@ -78,6 +79,47 @@ var results = await db.ExecuteQueryAsync(@"
 
 ---
 
+## GraphRAG — Lightweight Graph Capabilities
+
+Planned graph traversal capabilities enabling hybrid **Vector + Graph** queries for AI Agents, code analysis, and knowledge graphs.
+
+### Documentation
+
+| Document | Purpose | Read Time |
+|----------|---------|-----------|
+| [GraphRAG Overview](./graphrag/README.md) | Overview, architecture, and doc index | 10 min |
+| [Proposal Analysis](./graphrag/GRAPHRAG_PROPOSAL_ANALYSIS.md) | Feasibility analysis and competitive landscape | 25 min |
+| [Implementation Plan](./graphrag/GRAPHRAG_IMPLEMENTATION_PLAN.md) | Comprehensive 5-phase implementation plan | 30 min |
+| [Implementation Startpoint](./graphrag/GRAPHRAG_IMPLEMENTATION_STARTPOINT.md) | Engineering startpoint and architecture decision record | 15 min |
+| [v2 Roadmap](./graphrag/ROADMAP_V2_GRAPHRAG_SYNC.md) | Integrated product roadmap (GraphRAG + Sync) | 20 min |
+| [Strategic Recommendations](./graphrag/STRATEGIC_RECOMMENDATIONS.md) | Executive decision document | 15 min |
+
+### Key Features (Planned)
+
+- **ROWREF Column Type:** O(1) index-free adjacency via direct row pointers
+- **BFS/DFS Traversal Engine:** 1M nodes in <100ms
+- **GRAPH_TRAVERSE() SQL Function:** Graph queries in standard SQL
+- **Hybrid Vector + Graph Queries:** Combine HNSW similarity with structural constraints
+- **Status:** 📋 Planned for v1.4.0 (Q3 2026)
+
+### Quick Example (Target API)
+
+```sql
+-- Find code chunks semantically similar to query,
+-- but only if connected to DataRepository within 3 hops
+SELECT chunk_id, content
+FROM code_chunks
+WHERE
+    vector_distance(embedding, @query) < 0.3
+    AND chunk_id IN (
+        GRAPH_TRAVERSE('code_chunks', @start_id, 'belongs_to', 3)
+    )
+ORDER BY vector_distance(embedding, @query)
+LIMIT 10;
+```
+
+---
+
 ## Collations
 
 Complete collation support with 4 types across 7 implementation phases.

SharpCoreDB.sln

@@ -1,6 +1,6 @@
 # SharpCoreDB Strategic Documentation Index
 
-**Date:** 2026-02-14  
+**Date:** 2026-02-15  
 **Status:** Complete - Ready for Executive Review  
 **Access:** All documents in `/docs` folder
 
@@ -10,7 +10,7 @@
 
 ### Core Strategic Documents
 
-#### 1. **GRAPHRAG_PROPOSAL_ANALYSIS.md** ⭐
+#### 1. **[graphrag/GRAPHRAG_PROPOSAL_ANALYSIS.md](graphrag/GRAPHRAG_PROPOSAL_ANALYSIS.md)** ⭐
 - **Purpose:** Feasibility analysis for graph RAG implementation
 - **Audience:** Technical architects, product managers
 - **Key Sections:**
@@ -22,6 +22,26 @@
 - **Key Finding:** SharpCoreDB can uniquely combine vectors + graphs in one .NET DLL
 - **Recommendation:** ✅ Proceed with Phase 1 (v1.4.0, Q3 2026)
 
+#### 1b. **[graphrag/GRAPHRAG_IMPLEMENTATION_PLAN.md](graphrag/GRAPHRAG_IMPLEMENTATION_PLAN.md)** ⭐⭐ *NEW*
+- **Purpose:** Comprehensive phased implementation plan with file-level detail
+- **Audience:** Engineers, tech leads
+- **Key Sections:**
+  - 5-phase implementation plan (ROWREF → Traversal → SQL → Hybrid → EF Core)
+  - File inventory (14 new files, 9 modified files)
+  - Testing strategy (230+ tests across 9 topologies)
+  - Performance targets and benchmarks
+  - Risk register with 8 tracked risks
+  - 12-week schedule mapped to v1.4.0–v2.0.0 releases
+
+#### 1c. **[graphrag/GRAPHRAG_IMPLEMENTATION_STARTPOINT.md](graphrag/GRAPHRAG_IMPLEMENTATION_STARTPOINT.md)** ⭐ *NEW*
+- **Purpose:** Engineering startpoint and architecture decision record for GraphRAG
+- **Audience:** Engineers, tech leads
+- **Key Sections:**
+  - Two-layer architecture decision (core + extension)
+  - Minimal core changes for ROWREF plumbing
+  - Graph extension project scaffolding
+  - Initial work items and rollout guidance
+
 #### 2. **DOTMIM_SYNC_PROVIDER_ANALYSIS.md** ⭐
 - **Purpose:** Feasibility analysis for Dotmim.Sync provider implementation
 - **Audience:** Technical architects, security engineers
@@ -34,7 +54,7 @@
 - **Key Finding:** Enables "offline-first, privacy-preserving" SaaS architecture
 - **Recommendation:** ✅ Proceed with Phase 1 (v1.4.0, Q3 2026)
 
-#### 3. **ROADMAP_V2_GRAPHRAG_SYNC.md** ⭐⭐
+#### 3. **[graphrag/ROADMAP_V2_GRAPHRAG_SYNC.md](graphrag/ROADMAP_V2_GRAPHRAG_SYNC.md)** ⭐⭐
 - **Purpose:** Integrated product roadmap for v1.4.0 → v2.0.0
 - **Audience:** Executive team, product managers, engineers
 - **Key Sections:**
@@ -51,7 +71,7 @@
   - **v2.0.0** (Q2 2027): Production platform
 - **Recommendation:** ✅ Approve entire roadmap, start Phase 1 immediately
 
-#### 4. **STRATEGIC_RECOMMENDATIONS.md** ⭐⭐⭐
+#### 4. **[graphrag/STRATEGIC_RECOMMENDATIONS.md](graphrag/STRATEGIC_RECOMMENDATIONS.md)** ⭐⭐⭐
 - **Purpose:** Executive decision document for v2 roadmap approval
 - **Audience:** C-level executives, board members
 - **Key Sections:**