fix: orphaned resources query bugs + doc cleanup

- Fix SQL Elastic Pools query: add leftanti join to filter for pools
  with no databases (previously flagged ALL pools as orphaned)
- Fix Private Endpoints query: check both privateLinkServiceConnections
  and manualPrivateLinkServiceConnections to avoid false positives on
  manual-approval endpoints
- Update USAGE_EXAMPLES.md: replace stale NIC/NSG references with the
  current 11 resource types
- Update CHANGELOG.md: add v3.4.0 entry for Databricks tools (PR #28)
  and orphaned resources expansion + fixes (PR #30)
- Align formatters.py section dividers for consistency

Author: msftnadavbh

CHANGELOG.md

@@ -5,6 +5,32 @@ All notable changes to the Azure Pricing MCP Server will be documented in this f
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.4.0] - 2026-03-03
+
+### Added
+
+- **Azure Databricks DBU Pricing Tools** (contributed by PR #28)
+  - `databricks_dbu_pricing` - Search and list Azure Databricks DBU rates by workload type, tier, and region
+  - `databricks_cost_estimate` - Estimate monthly and annual Databricks costs based on DBU consumption
+  - `databricks_compare_workloads` - Compare DBU costs across workload types or regions
+  - Supports 14 workload types with fuzzy alias matching (e.g., 'etl' -> 'jobs', 'warehouse' -> 'serverless sql')
+  - Real-time pricing from Azure Retail Prices API — no authentication required
+  - Photon pricing comparison included automatically
+
+### Changed
+
+- **Orphaned Resource Detection** expanded from 5 to 11 resource types (contributed by [@iditbnaya](https://github.com/iditbnaya), PR #30)
+  - Removed NICs and NSGs (no cost impact — not billable resources)
+  - Added: SQL Elastic Pools, Application Gateways, NAT Gateways, Load Balancers, Private DNS Zones, Private Endpoints, Virtual Network Gateways, DDoS Protection Plans
+  - Fixed SQL Elastic Pools query to correctly filter for pools with no databases (leftanti join)
+  - Fixed Private Endpoints query to check both auto-approved and manual-approval connections
+  - Updated all documentation (FEATURES.md, ORPHANED_RESOURCES.md, TOOLS.md, USAGE_EXAMPLES.md)
+
+### Documentation
+
+- Added Databricks DBU pricing tools to TOOLS.md
+- Updated orphaned resource documentation across all docs
+
 ## [3.3.0] - 2026-02-12
 
 ### Added
@@ -36,7 +62,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - **Orphaned Resource Detection Tool** (contributed by [@iditbnaya](https://github.com/iditbnaya))
   - `find_orphaned_resources` - Detect orphaned Azure resources and compute wasted costs
-  - Scans for unattached managed disks, orphaned NICs, public IPs, NSGs, and empty App Service Plans
+  - Initial release: scans for unattached managed disks, orphaned NICs, public IPs, NSGs, and empty App Service Plans
   - Integrates with Azure Cost Management API for historical cost lookup
   - Groups results by resource type with per-type summary tables
   - Configurable lookback period (default: 60 days)

docs/USAGE_EXAMPLES.md

@@ -373,7 +373,7 @@ Subscriptions scanned: 3
 |---------------|-------|-----------|
 | Unattached Disk | 2 | $85.00 |
 | Orphaned Public IP | 2 | $42.50 |
-| Orphaned NSG | 1 | $0.00 |
+| Orphaned Load Balancer | 1 | $18.25 |
 ```
 
 ### Custom Lookback Period
@@ -395,10 +395,16 @@ The tool detects these orphaned resource types:
 | Resource Type | Detection Criteria |
 |---------------|--------------------|
 | **Unattached Disk** | Managed disks with no `managedBy` reference |
-| **Orphaned NIC** | Network interfaces not attached to a VM or private endpoint |
 | **Orphaned Public IP** | Public IPs not associated with any resource |
-| **Orphaned NSG** | Network security groups not attached to any NIC or subnet |
 | **Empty App Service Plan** | App Service Plans with zero hosted apps |
+| **Orphaned SQL Elastic Pool** | SQL Elastic Pools with no databases in the pool |
+| **Orphaned Application Gateway** | Application gateways with no backend address pools or targets |
+| **Orphaned NAT Gateway** | NAT gateways not associated with any subnet |
+| **Orphaned Load Balancer** | Load balancers with no backend address pools |
+| **Orphaned Private DNS Zone** | Private DNS zones with no virtual network links |
+| **Orphaned Private Endpoint** | Private endpoints with no connections or unapproved connections |
+| **Orphaned Virtual Network Gateway** | Virtual network gateways with no IP configurations |
+| **Orphaned DDoS Protection Plan** | DDoS protection plans with no associated virtual networks |
 
 ### Cost Analysis
 

src/azure_pricing_mcp/formatters.py

@@ -645,7 +645,8 @@ def format_orphaned_resources_response(result: dict[str, Any]) -> str:
             f"Scanned {len(subscriptions)} subscription(s) — "
             "no orphaned disks, public IPs, App Service Plans, SQL Elastic Pools, "
             "Application Gateways, NAT Gateways, Load Balancers, Private DNS Zones, "
-            "Private Endpoints, Virtual Network Gateways, or DDoS Protection Plans detected."
+            "Private Endpoints, Virtual Network Gateways, "
+            "or DDoS Protection Plans detected."
         )
 
     # Collect all orphaned resources across subscriptions
@@ -697,9 +698,9 @@ def format_orphaned_resources_response(result: dict[str, Any]) -> str:
     return "\n".join(response_lines)
 
 
-# ---------------------------------------------------------------------------
+# =============================================================================
 # PTU Sizing + Cost Planner
-# ---------------------------------------------------------------------------
+# =============================================================================
 
 
 def format_ptu_sizing_response(result: dict[str, Any]) -> str:

src/azure_pricing_mcp/services/orphaned_resources.py

@@ -69,9 +69,17 @@
 """
 
 # Resource Graph query for orphaned SQL Elastic Pools (no databases)
+# Uses leftanti join: keep only pools that have NO matching database.
 ORPHANED_SQL_ELASTIC_POOLS_QUERY = """
 Resources
 | where type =~ 'microsoft.sql/servers/elasticpools'
+| extend poolId = tolower(id)
+| join kind=leftanti (
+    Resources
+    | where type =~ 'microsoft.sql/servers/databases'
+    | where isnotempty(properties.elasticPoolId)
+    | extend poolId = tolower(properties.elasticPoolId)
+) on poolId
 | project id, name, type, location, resourceGroup,
     subscriptionId,
     sku = tostring(sku.name),
@@ -123,12 +131,18 @@
 """
 
 # Resource Graph query for orphaned Private Endpoints (no connections or not approved)
+# Checks both auto-approved (privateLinkServiceConnections) and manual-approval
+# (manualPrivateLinkServiceConnections) arrays to avoid false positives.
 ORPHANED_PRIVATE_ENDPOINTS_QUERY = """
 Resources
 | where type =~ 'microsoft.network/privateendpoints'
-| where isnull(properties.privateLinkServiceConnections)
-    or array_length(properties.privateLinkServiceConnections) == 0
-    or properties.privateLinkServiceConnections[0].properties.privateLinkServiceConnectionState.status != 'Approved'
+| extend autoConns  = array_length(properties.privateLinkServiceConnections)
+| extend manualConns = array_length(properties.manualPrivateLinkServiceConnections)
+| extend autoStatus  = tostring(properties.privateLinkServiceConnections[0].properties.privateLinkServiceConnectionState.status)
+| extend manualStatus = tostring(properties.manualPrivateLinkServiceConnections[0].properties.privateLinkServiceConnectionState.status)
+| where (isnull(autoConns) or autoConns == 0) and (isnull(manualConns) or manualConns == 0)
+    or ((isnull(autoConns) or autoConns == 0 or autoStatus != 'Approved')
+        and (isnull(manualConns) or manualConns == 0 or manualStatus != 'Approved'))
 | project id, name, type, location, resourceGroup,
     subscriptionId
 """