fix(file-search): isolate and queue concurrent searches

[icecrasher321]

Summary

• Raise workspace file-search admission ceilings to 20 per workspace and 5,000 per database.
• Isolate searches in a dedicated five-connection client pool per process, with a bounded queue that rotates workspaces and reserves waiting capacity across tenants.
• Reuse application request cancellation and the shared deadline helper to bound queueing, connection acquisition, and execution. Keep capacity reserved until underlying database work settles.
• Preserve exact/regex results and line numbers; document fleet capacity and connection-cleanup boundaries.

Type of Change

• Bug fix

Testing

• 185 focused unit tests passed, covering cancellation propagation, queue fairness/overflow, deadlines, stalled acquisition, late completion, and slot release.
• 53 PostgreSQL 17 integration tests passed; one optional benchmark skipped. Covers pool isolation, a 20-search burst, admission saturation/recovery, complete-line regex, revision changes, and cleanup.
• Application/database type checks, lint, repository audits, block registry, and docs checks.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

[vercel]

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Project	Deployment	Actions	Updated
docs	Ready	Preview	Sep 18, 2026 5:49pm UTC

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge; the prior shared-pool contention finding is resolved by the dedicated search pool, and no new actionable failures remain.

Summary

The PR raises database-level file-search admission ceilings while isolating searches in a dedicated five-connection pool and placing a bounded, workspace-rotating queue ahead of connection acquisition.

• Propagates HTTP and tool cancellation into search execution.
• Holds local admission capacity until underlying database work settles, including after caller timeout.
• Adds per-workspace queue reservations, execution deadlines, pool-isolation tests, and operational documentation.
• Moves database pool profiles into a separately exported module so admission and driver limits share one source of truth.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  A[Search request] --> B[Authorization and folder scope]
  B --> C{Local admission}
  C -->|Capacity available| D[Active search slot]
  C -->|Busy| E[Bounded per-workspace queue]
  E -->|Fair rotation| D
  E -->|Cancelled or expired| F[Retryable unavailable error]
  D --> G[Dedicated search connection pool]
  G --> H[Database advisory admission]
  H --> I[Repeatable-read search transaction]
  I --> J[Results and index coverage]
  I -->|Settles after success or failure| K[Release active slot]
  G -->|Caller deadline first| F
  G -->|Underlying work later settles| K

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[cubic-dev-ai]

All reported issues were addressed across 3 files

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[icecrasher321]

@greptile

[icecrasher321]

@cubic-dev-ai review this PR

[cubic-dev-ai]

@cubic-dev-ai review this PR

@icecrasher321 I have started the AI code review. It will take a few minutes to complete.

[cubic-dev-ai]

No issues found across 13 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}

[icecrasher321]

@greptile

[icecrasher321]

@cubic-dev-ai review this PR

[cubic-dev-ai]

@cubic-dev-ai review this PR

@icecrasher321 I have started the AI code review. It will take a few minutes to complete.

[icecrasher321]

@cubic-dev-ai review this PR

[cubic-dev-ai]

@cubic-dev-ai review this PR

@icecrasher321 I have started the AI code review. It will take a few minutes to complete.

[cubic-dev-ai]

No issues found across 14 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}

[cubic-dev-ai]

No issues found across 14 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}