perf: batch expand operations to reduce DB queries

[Maxim Manuylov (maxmanuylov)]

No description provided.

[Copilot]

Pull request overview

This PR updates the permission Expand execution to reduce per-entity database queries by batching entity IDs (IN-clause queries) and adds an internal per-operation goroutine concurrency limiter to avoid goroutine explosion during large expands.

Changes:

• Add functional options to ExpandEngine for concurrency limiting and max batch size, wiring these from service config.
• Batch Expand’s relation expansion by grouping usersets and querying relationships for multiple entity IDs in a single call.
• Add/adjust tests to exercise the new batching paths and update version metadata.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pkg/cmd/serve.go	Passes concurrency and batch-size options into the Expand engine using service config values.
internal/info.go	Bumps the build/version string.
internal/engines/utils.go	Introduces ExpandOption functional options (ExpandConcurrencyLimit, ExpandMaxBatchSize).
internal/engines/expand.go	Implements batching for expand operations and adds per-operation goroutine concurrency limiting.
internal/engines/expand_test.go	Updates tests for method-based expand operations and adds batching-focused test cases.

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated no new comments.

Suppressed comments (1)

internal/engines/expand.go:44

• NewExpandEngine applies options without validating them. If ExpandConcurrencyLimit or ExpandMaxBatchSize are set to 0/negative, expandOperation will deadlock (channel capacity 0) and batching loops using i += engine.maxBatchSize can become infinite. Consider clamping to defaults after applying opts.

func NewExpandEngine(sr storage.SchemaReader, rr storage.DataReader, opts ...ExpandOption) *ExpandEngine {
	engine := &ExpandEngine{
		schemaReader:     sr,
		dataReader:       rr,
		concurrencyLimit: _defaultConcurrencyLimit,
		maxBatchSize:     _defaultMaxBatchSize,
	}
	for _, opt := range opts {
		opt(engine)
	}
	return engine