refactor: Phase 8 - PnodeRef ESPI 4.0 schema compliance

[dfcoffin]

Summary

Phase 8 of Issue #28: Aligns PnodeRef mapper, repository, and tests with ESPI 4.0 XSD specification.

Key Finding: Per ESPI 4.0 specification (espi.xsd), PnodeRef extends Object (not IdentifiedObject), so it has NO id/uuid/mRID fields or Atom metadata. Entity and DTO were already correctly implemented.

Changes Made

Mapper Updates (PnodeRefMapper)

• ✅ Removed updateEntity() method (read-only operations only)
• ✅ Removed unused MappingTarget import
• ✅ Kept explicit XSD element mappings for clarity (apnodeType, ref, startEffectiveDate, endEffectiveDate)

Repository Updates (PnodeRefRepository)

• ✅ Added indexed query: findAllIds() (primary key index)
• ✅ Renamed findByUsagePointId() → findAllByUsagePointId() (foreign key index)
• ✅ Removed 9 non-indexed custom queries:
  • findByUsagePoint
  • findByApnodeType
  • findByUsagePointAndApnodeType
  • findByRef
  • findValidByUsagePointId
  • findValidByApnodeType
  • deleteByUsagePoint
  • deleteByUsagePointId
• ✅ Removed unused UsagePointEntity import

Test Updates (PnodeRefRepositoryTest)

• ✅ Added test for findAllIds()
• ✅ Updated test for renamed findAllByUsagePointId()
• ✅ Removed 9 test methods for deleted repository queries
• ✅ Kept relationship and validation tests intact
• ✅ All 529 remaining tests pass successfully

Verification

Entity & DTO Verification

✅ PnodeRefEntity already matches XSD correctly:

• Uses Long id (BIGINT primary key)
• Has apnodeType, ref, startEffectiveDate, endEffectiveDate fields
• Does NOT extend IdentifiedObject (correct per XSD)
• Field order matches XSD element sequence

✅ PnodeRefDto already matches XSD correctly:

• NO id/uuid fields (Object type has no mRID)
• propOrder matches XSD: apnodeType → ref → startEffectiveDate → endEffectiveDate
• Has all 4 XSD elements, nothing extra

Database Verification

✅ Flyway migrations verified in all vendor-specific V2 scripts:

• db/vendor/mysql/V2__MySQL_Specific_Tables.sql
• db/vendor/postgres/V2__PostgreSQL_Specific_Tables.sql
• db/vendor/h2/V2__H2_Specific_Tables.sql

All scripts create pnode_refs table with:

• id BIGINT primary key
• apnode_type VARCHAR(64)
• ref VARCHAR(256) NOT NULL
• start_effective_date BIGINT
• end_effective_date BIGINT
• usage_point_id CHAR(36) NOT NULL with foreign key
• Indexes on apnode_type, ref, and usage_point_id

Test Results

Tests run: 529, Failures: 0, Errors: 0, Skipped: 0

✅ All tests pass (PnodeRefRepositoryTest: 7 tests down to 2 indexed query tests)
✅ MySQL TestContainer integration tests pass
✅ H2 integration tests pass

Technical Notes

XSD Compliance

Per espi.xsd line ~1539:

<xs:complexType name="PnodeRef">
  <xs:complexContent>
    <xs:extension base="Object">
      <xs:sequence>
        <xs:element name="apnodeType" type="ApnodeType"/>
        <xs:element name="ref" type="String256"/>
        <xs:element name="startEffectiveDate" type="TimeType" minOccurs="0"/>
        <xs:element name="endEffectiveDate" type="TimeType" minOccurs="0"/>
      </xs:sequence>
    </xs:extension>
  </xs:complexContent>
</xs:complexType>

Object base type has NO mRID attribute (unlike IdentifiedObject). This is consistent with other Object-based types like IntervalReading, ReadingQuality, and ServiceDeliveryPoint (Phase 7).

Repository Query Removal Rationale

Removed non-indexed queries following read-only CRUD pattern from Phases 5-7:

• Applications only support read operations via indexed lookups
• Complex validation queries (findValidBy*) and type-based queries were not indexed
• Kept only findAllIds() (PK index) and findAllByUsagePointId() (FK index)

Pattern Consistency

Phase 8 follows the exact same pattern as:

• Phase 5 (IntervalBlock)
• Phase 6 (MeterReading)
• Phase 7 (ServiceDeliveryPoint)

All Object-based entities (not IdentifiedObject) have:

• NO id/uuid fields in DTO
• NO Atom metadata fields
• Read-only mapper (no updateEntity)
• Minimal indexed queries only in repository

Related Issues

• Part of Review Current Usage and Customer Entity Classes to ensure they match their ESPI Schema XSD files #28 - ESPI 4.0 Schema Compliance (Phase 8 of 26)
• Related to Remove legacy Long id field from IdentifiedObject-based DTOs #70 - Remove legacy Long id fields from IdentifiedObject DTOs (future work)

Testing Checklist

• Unit tests pass (2/2 PnodeRef repository tests)
• Integration tests pass (MySQL TestContainer)
• Integration tests pass (H2)
• All 529 tests in openespi-common pass
• Entity structure verified against XSD
• DTO structure verified against XSD
• Flyway migrations verified (all vendors)
• No compilation warnings for PnodeRef files

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