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+# Task Log: Multi-Tenant Implementation Audit & Document Count Bug Fix
+
+**Date:** 2025-01-06 16:45
+**Mode:** beastmode
+**Status:** ✅ COMPLETED
+
+---
+
+## Actions Performed
+
+1. **Fixed KB document count bug** - Modified `tenant_service.py` to compute document counts via LEFT JOINs from `lightrag_doc_full`, `lightrag_vdb_entity`, `lightrag_vdb_relation` tables
+2. **Verified fix in browser** - UI now correctly shows "1 docs" for TechStart/Main KB
+3. **Audited multi-tenant storage implementations** - Reviewed all tenant support modules in `lightrag/kg/`
+4. **Created new test file** - `tests/test_tenant_kb_document_count.py` with 7 comprehensive tests
+5. **Ran test suite** - 93 multi-tenant tests passing
+
+---
+
+## Decisions Made
+
+1. Used workspace pattern `{tenant_id}:{kb_id}` for document queries (consistent with existing codebase)
+2. Used LEFT JOIN instead of subqueries for better performance on count aggregation
+3. Defaulted counts to 0 when no documents/entities/relationships exist (graceful handling of NULL)
+4. Mocked database layer in new tests to avoid integration dependencies
+
+---
+
+## Key Changes
+
+### Modified Files
+
+| File | Change |
+|------|--------|
+| `lightrag/services/tenant_service.py` | Fixed `list_knowledge_bases()` and `get_knowledge_base()` to compute document/entity/relationship counts |
+
+### Created Files
+
+| File | Purpose |
+|------|---------|
+| `tests/test_tenant_kb_document_count.py` | Unit tests for document count functionality |
+
+---
+
+## Test Results
+
+| Test Suite | Tests | Status |
+|------------|-------|--------|
+| `test_tenant_models.py` | 16 | ✅ PASSED |
+| `test_tenant_storage_phase3.py` | 22 | ✅ PASSED |
+| `test_multi_tenant_backends.py` | 37 | ✅ PASSED |
+| `test_workspace_isolation.py` | 11 | ✅ PASSED |
+| `test_tenant_kb_document_count.py` | 7 | ✅ PASSED |
+| **TOTAL** | **93** | ✅ PASSED |
+
+---
+
+## Lessons/Insights
+
+1. **Table names matter** - Initial fix used wrong table names (`lightrag_vdb` vs `lightrag_vdb_entity`); discovered via server error logs
+2. **Workspace format** - Multi-tenant isolation uses `{tenant_id}:{kb_id}` composite key stored in `workspace` column
+3. **Existing test coverage** - Multi-tenant implementation already had 86+ comprehensive tests
+4. **API test isolation** - Some API route tests fail collection due to argparse conflicts; need to be run separately or with proper config initialization
+
+---
+
+## Storage Backends Reviewed
+
+All storage backends have comprehensive multi-tenant support:
+
+| Backend | Tenant Support Module | Isolation Method |
+|---------|----------------------|------------------|
+| PostgreSQL | `postgres_tenant_support.py` | `TenantSQLBuilder`, workspace column |
+| MongoDB | `mongo_tenant_support.py` | `tenant_id`/`kb_id` fields, compound indexes |
+| Redis | `redis_tenant_support.py` | Key prefixing `{tenant}:{kb}:key` |
+| Neo4j | `neo4j_tenant_support.py` | Node properties, tenant constraints |
+| Milvus/Qdrant | `vector_tenant_support.py` | Metadata fields, filter expressions |
+
+---
+
+## Next Steps (Optional)
+
+1. Fix API test isolation by mocking `parse_args()` in test setup
+2. Consider caching document counts for performance at scale
+3. Add integration tests that run against real PostgreSQL database
+