feat(transactions): improve search relevance and server-side filtering

[chiemezie1]

Summary

This PR improves backend transaction search by introducing relevance-based ordering and server-side filtering for common search terms.

What changed

• Added relevance scoring for free-text transaction search across:
  • transaction hash
  • memo / description fields
  • reference IDs
  • related metadata and identifiers
• Kept the search predicates on the database side to avoid full-table scans for common cases.
• Added safe defaults for search requests:
  • bounded execution time
  • capped result size
  • safe pagination behavior
• Documented the new search semantics in the transaction API docs.

Validation

• Added regression tests covering:
  • relevance ordering
  • capped search pagination
  • transaction search service behavior

Acceptance criteria

• Server-side filtering is used for search predicates
• Deterministic ordering is applied for ties
• Relevance scoring is covered by tests
• Search endpoint semantics are documented

Closes: #1118

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
nestera	Skipped		Jun 30, 2026 1:28am

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