CROSSLINK-274 patron request facets

[adamdickmeiss]

No description provided.

[Copilot]

Pull request overview

Adds faceting support to the Broker patron request listing endpoint (CROSSLINK-274), allowing clients to request aggregated counts by selected fields (currently requester/supplier symbol) alongside the normal paginated results.

Changes:

• Extends OpenAPI for GET /patron_requests with a facets query parameter and a facets-capable about schema.
• Implements facets retrieval in the patron request API handler and repo layer, backed by a new SQLC query template plus a CQL-aware execution helper.
• Adds unit + integration tests covering successful faceting and error handling (invalid facet values, DB error).

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
broker/test/patron_request/api/api-handler_test.go	Integration tests validating facets behavior via HTTP.
broker/sqlc/pr_query.sql	Adds a facets aggregation query template for patron_request_search_view.
broker/patron_request/db/prrepo.go	Adds facets types + repo method to fetch facet results.
broker/patron_request/db/prcql.go	Adds CQL-aware facets query execution with runtime column substitution.
broker/patron_request/api/api-handler.go	Wires facets into GetPatronRequests response (about.facets).
broker/patron_request/api/api-handler_test.go	Unit tests for handler error paths when facets are requested.
broker/oapi/open-api.yaml	Defines facets parameter + facets result schemas; updates PatronRequests.about schema.