feat: ESPI 4.0 Schema Compliance - Phase 16c: UsagePoint Repository Cleanup

[dfcoffin]

Summary

This PR implements Phase 16c of the UsagePoint schema compliance work, cleaning up the repository to remove non-indexed queries and convert to Spring Data JPA derived query methods for optimal performance.

Phase 16 Strategy

Phase 16 (UsagePoint) is being split into sub-phases:

• Phase 16a (PR feat: ESPI 4.0 Schema Compliance - Phase 16a: UsagePoint Add Missing Fields #83): Add missing Boolean/String fields ✅ MERGED
• Phase 16b (PR feat: ESPI 4.0 Schema Compliance - Phase 16b: UsagePoint Add Enum Fields & Reorder #84): Add enum fields + reorder fields to match XSD ✅ MERGED
• Phase 16c (THIS PR): Repository cleanup ✅
• Phase 16d: Mapper bidirectional updates
• Phase 16e: XML schema validation tests

Changes in Phase 16c

🗑️ Removed Methods (Non-Indexed or Redundant)

Method	Reason for Removal
findByResourceUri(String uri)	Queries uri field which is NOT indexed AND is a legacy field NOT in ESPI 4.0 XSD
findAllIds()	Full table scan without WHERE clause - performance risk
existsByUuid(UUID uuid)	Use built-in existsById(UUID id) instead
deleteByUuid(UUID uuid)	Use built-in deleteById(UUID id) instead

✅ Retained Methods (All Use Indexed Columns)

Method	Indexed Column Used	Notes
findAllByRetailCustomerId(Long)	retail_customer_id	Converted to Spring Data JPA derived query
findAllByUpdatedAfter(LocalDateTime)	updated	Converted to Spring Data JPA derived query
findByRelatedHref(String)	usage_point_related_links(usage_point_id)	Uses indexed relationship table
findAllIdsByRetailCustomerId(Long)	retail_customer_id	Custom JPQL for ID-only projection

📊 Database Index Analysis

Current indexed columns on usage_points table:

Column	Indexed	In XSD?	Used by Queries?
kind	✅	❌	❌ (candidate for removal)
status	✅	✅	❌
retail_customer_id	✅	✅	✅
service_delivery_point_id	✅	✅	❌
local_time_parameters_id	✅	✅	❌
created	✅	✅	❌
updated	✅	✅	✅

Key Findings:

• kind field: Indexed but NOT in ESPI 4.0 XSD (legacy field, no queries use it)
• uri field: Not indexed, NOT in ESPI 4.0 XSD (legacy field, removed from queries)

🧪 Test Updates

Removed 4 test methods for deleted repository methods:

• shouldFindUsagePointByResourceUri()
• shouldFindAllUsagePointIds()
• shouldCheckIfUsagePointExistsByUuid()
• shouldDeleteUsagePointByUuid()

Updated tests:

• shouldHandleEmptyResultsGracefully() - Removed references to deleted methods
• shouldFindAllUsagePointsUpdatedAfterTimestamp() - Updated method call to findAllByUpdatedAfter()

Technical Details

Performance Benefits

• ✅ Eliminates full table scans (removed findAllIds)
• ✅ All queries use database indexes for O(log n) lookups instead of O(n) scans
• ✅ Removes queries on non-indexed legacy field (uri)

Spring Data JPA Patterns

• Derived query methods (e.g., findAllByRetailCustomerId) are automatically implemented by Spring Data JPA at runtime
• Reduces custom JPQL code and improves maintainability
• Type-safe method names reduce query errors
• Example: findAllByRetailCustomerId → Spring generates SELECT ... WHERE retail_customer_id = ?

Repository Documentation

Added comprehensive JavaDoc to repository interface explaining:

• Phase 16c cleanup rationale
• Which columns are indexed
• Why certain methods were removed
• Notes to use built-in JpaRepository methods

Test Results

Tests run: 580, Failures: 0, Errors: 0, Skipped: 0
BUILD SUCCESS

Note: Was 584 tests, now 580 (removed 4 tests for deleted methods)

Migration Impact

⚠️ Breaking Changes

The following public repository methods have been removed:

• findByResourceUri(String uri) - Use alternative approach or migrate away from legacy uri field
• findAllIds() - Use findAll() and extract IDs, or findAllIdsByRetailCustomerId() for filtered IDs
• existsByUuid(UUID uuid) - Use built-in existsById(UUID id) instead
• deleteByUuid(UUID uuid) - Use built-in deleteById(UUID id) instead

✅ No Service Layer Changes Required

Checked all usages in service layer:

• UsagePointServiceImpl uses findAllIdsByRetailCustomerId() - Still available ✅
• No services were using the removed methods ✅

Related

• Issue Review Current Usage and Customer Entity Classes to ensure they match their ESPI Schema XSD files #28 - Phase 16: UsagePoint
• PR feat: ESPI 4.0 Schema Compliance - Phase 16a: UsagePoint Add Missing Fields #83 - Phase 16a: Add Missing Boolean/String Fields (merged)
• PR feat: ESPI 4.0 Schema Compliance - Phase 16b: UsagePoint Add Enum Fields & Reorder #84 - Phase 16b: Add Enum Fields & Reorder (merged)
• Part 3 of 5 sub-phases for complete UsagePoint compliance

Next Steps (Phase 16d)

• Mapper bidirectional updates
• Update Entity-to-DTO mappings
• Update DTO-to-Entity mappings
• Handle all embedded SummaryMeasurement mappings

🤖 Generated with Claude Code