Complete entity relationship cleanup with ElectricPowerQualitySummaryEntity

- Remove bidirectional relationship management methods from ElectricPowerQualitySummaryEntity:
  * Complex setUsagePoint with bidirectional logic

- Remove corresponding methods from UsagePointEntity:
  * addElectricPowerQualitySummary/removeElectricPowerQualitySummary methods

- Simplify setUpResource() and unlink() methods to use direct field assignment

This completes the systematic cleanup of all major entity bidirectional relationship management,
moving complex relationship logic to the DataCustodian/ThirdParty application layers.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: dfcoffin

src/main/java/org/greenbuttonalliance/espi/common/domain/usage/ElectricPowerQualitySummaryEntity.java

@@ -172,25 +172,8 @@ public ElectricPowerQualitySummaryEntity(DateTimeInterval summaryInterval) {
         this.summaryInterval = summaryInterval;
     }
 
-    /**
-     * Sets the usage point for this power quality summary.
-     * This method ensures the bidirectional relationship is maintained.
-     * 
-     * @param usagePoint the usage point to set
-     */
-    public void setUsagePoint(UsagePointEntity usagePoint) {
-        // Remove from old usage point if exists
-        if (this.usagePoint != null && this.usagePoint != usagePoint) {
-            this.usagePoint.removeElectricPowerQualitySummary(this);
-        }
-        
-        this.usagePoint = usagePoint;
-        
-        // Add to new usage point if not null
-        if (usagePoint != null && !usagePoint.getElectricPowerQualitySummaries().contains(this)) {
-            usagePoint.addElectricPowerQualitySummary(this);
-        }
-    }
+    // Note: Simple setUsagePoint setter is generated by Lombok @Data
+    // Complex bidirectional relationship management removed - handled by DataCustodian/ThirdParty applications
 
     /**
      * Generates the self href for this electric power quality summary.
@@ -277,19 +260,20 @@ public void merge(ElectricPowerQualitySummaryEntity other) {
     public void unlink() {
         clearRelatedLinks();
 
-        // Clear relationships
-        setUsagePoint(null);
+        // Clear relationships with simple field assignment
+        this.usagePoint = null;
     }
 
     /**
      * Sets up the parent relationship with a usage point.
      * Used by the resource management system.
+     * Note: Bidirectional relationship setup handled by applications.
      * 
      * @param resource the parent usage point resource
      */
     public void setUpResource(IdentifiedObjectEntity resource) {
-        if (resource instanceof UsagePointEntity usagePointEntity) {
-            usagePointEntity.addElectricPowerQualitySummary(this);
+        if (resource instanceof UsagePointEntity parentUsagePoint) {
+            this.usagePoint = parentUsagePoint;
         }
     }
 

src/main/java/org/greenbuttonalliance/espi/common/domain/usage/UsagePointEntity.java

@@ -176,29 +176,8 @@ public String getUpHref() {
     // Note: Usage summary collection accessors are generated by Lombok @Data
     // Bidirectional relationship management methods removed - handled by DataCustodian/ThirdParty applications
 
-    /**
-     * Adds an electric power quality summary to this usage point.
-     * 
-     * @param summary the electric power quality summary to add
-     */
-    public void addElectricPowerQualitySummary(ElectricPowerQualitySummaryEntity summary) {
-        if (summary != null) {
-            summary.setUsagePoint(this);
-            electricPowerQualitySummaries.add(summary);
-        }
-    }
-
-    /**
-     * Removes an electric power quality summary from this usage point.
-     * 
-     * @param summary the electric power quality summary to remove
-     */
-    public void removeElectricPowerQualitySummary(ElectricPowerQualitySummaryEntity summary) {
-        if (summary != null) {
-            summary.setUsagePoint(null);
-            electricPowerQualitySummaries.remove(summary);
-        }
-    }
+    // Note: Electric power quality summary collection accessors are generated by Lombok @Data
+    // Bidirectional relationship management methods removed - handled by DataCustodian/ThirdParty applications
 
     // Note: Subscription collection accessors are generated by Lombok @Data
     // Bidirectional relationship management methods removed - handled by DataCustodian/ThirdParty applications