fix(db): prevent code review GDPR deletion timeouts

[eshurakov]

Summary

• add a concurrent index for cloud_agent_code_review_attempts.retry_of_attempt_id
• prevent self-referential retry cleanup scans from exceeding the GDPR page timeout

Root cause

Production EXPLAIN ANALYZE showed 9.74 seconds in the self-referential foreign-key trigger while deleting 78 attempts. The child lookup had no index on retry_of_attempt_id.

Verification

• pnpm --filter @kilocode/db typecheck
• pnpm --filter @kilocode/db lint
• POSTGRES_URL=... pnpm drizzle check
• POSTGRES_URL=... pnpm drizzle:verify-bootstrap
• changed-file formatting and git diff --check

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (4 files)

• packages/db/src/schema.ts
• packages/db/src/migrations/0242_magical_rhodey.sql
• packages/db/src/migrations/meta/0242_snapshot.json
• packages/db/src/migrations/meta/_journal.json

Previous Review Summary (commit 44a6aae)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit 44a6aae)

Status: No Issues Found | Recommendation: Merge

Files Reviewed (4 files)

• packages/db/src/schema.ts
• packages/db/src/migrations/0241_overconfident_chameleon.sql
• packages/db/src/migrations/meta/0241_snapshot.json
• packages/db/src/migrations/meta/_journal.json

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_{Reviewed by grok-4.6 · Input: 103K · Output: 7.5K · Cached: 335.1K}

_{Review guidance: REVIEW.md from base branch main}