v0.8.55: projection index for sim search

[waleedlatif1]

• fix(knowledge): retry a projection fill page after an index lock or statement timeout instead of ending the chain (fix(knowledge): retry a projection fill page after an index lock or statement timeout instead of ending the chain #8137)
• fix(knowledge): read the projection-filled probe off the partial index instead of a sequential scan (fix(knowledge): read the projection-filled probe off the partial index instead of a sequential scan #8139)

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1 Skipped Deployment

Project	Deployment	Actions	Updated
docs	Skipped		Sep 22, 2026 4:52pm UTC

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge; the changed probes preserve completion semantics, and the retry path remains bounded by both page limits and the task runtime budget.

Summary

This PR improves the projection source/ACL rollout by retrying transient page timeouts without losing the committed cursor and reshaping completion probes to favor the partial unfilled-row indexes.

• Retries lock and statement timeout failures in place with bounded exponential backoff and budget checks.
• Preserves continuation progress at the last committed page.
• Replaces EXISTS completion checks with ordered, capped scalar probes.
• Adds focused coverage for retry limits, cancellation classification, cursor stability, budget exhaustion, and probe SQL shape.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[Start projection page at committed cursor] --> B[Run page transaction]
  B -->|Committed| C[Advance cursor and reset timeout count]
  C --> D{Page empty?}
  D -->|No| A
  D -->|Yes| E[Probe unfilled partial index]
  B -->|Lock or statement timeout| F{Retry and budget available?}
  F -->|Yes| G[Bounded jittered pause]
  G --> A
  F -->|Budget exhausted| H[Return continuation from committed cursor]
  F -->|Retry limit exceeded| I[Propagate database error]
  E -->|No fillable rows| J[Analyze and prewarm projections]

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