v0.8.46: keyword search optimizations

[waleedlatif1]

• fix(file-search): isolate and queue concurrent searches (fix(file-search): isolate and queue concurrent searches #7952)
• improvement(knowledge): match keyword chunks before authorizing them (improvement(knowledge): match keyword chunks before authorizing them #7973)

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1 Skipped Deployment

Project	Deployment	Actions	Updated
docs	Skipped		Sep 18, 2026 7:00pm UTC

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge, with the changed authorization, admission, cancellation, and database-pool paths remaining internally consistent and covered by targeted tests.

Summary

This PR optimizes keyword search by matching chunks before evaluating document visibility and isolates workspace-file searches behind a dedicated database pool and fair, cancellation-aware admission queue.

• Reorders live keyword search into match, authorize, and rank stages.
• Adds bounded process-local queueing, caller deadlines, and cancellation propagation for workspace-file searches.
• Introduces a dedicated search database pool profile while retaining cross-process advisory-lock ceilings.
• Expands unit and integration coverage for query plans, pool isolation, saturation, fairness, timeout, and cancellation behavior.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[Authorized search request] --> B{Search type}
  B -->|Knowledge keyword| C[Match keyword chunk IDs]
  C --> D[Authorize matched documents]
  D --> E[Rank visible chunks]
  E --> F[Hydrate and recheck access]
  B -->|Workspace file| G[Process-local admission queue]
  G --> H[Dedicated search DB pool]
  H --> I[Workspace and global advisory admission]
  I --> J[Search transaction with SQL deadline]
  J --> K[Return bounded previews and coverage]

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