fix: prevent oversized Vectorize metadata

[stdAri]

Summary

• Compact Vectorize metadata per vector at the Worker /upsert boundary.
• Preserve structured metadata fields and adaptively compact oversized description and tags using UTF-8 JSON byte sizes.
• Add regression coverage for long descriptions, multiple oversized fields, and malformed license metadata.

Verification

• Targeted metadata tests: 4 passed.
• Worker TypeScript check: passed.
• ESLint: 0 errors (one pre-existing React Hook warning).
• Frontend build: passed.
• Worker deployed successfully with npm run deploy.
• Full frontend tests: 257 passed; one pre-existing RepositoryCard suite could not be collected because @testing-library/user-event is missing in the local environment.

Fixes the Vectorize 40016 oversized metadata error without changing local repository descriptions.

Summary by CodeRabbit

• New Features

  • Improved vector storage reliability by compacting oversized metadata while preserving important fields.
  • Added safe handling for malformed or oversized metadata, including Unicode-safe text and tag truncation.
  • Added validation and limits for similarity search result counts, with invalid values using a safe default and requests capped at 50 results.

• Bug Fixes

  • Prevented oversized metadata and excessive query limits from causing storage or search issues.
  • Preserved vector information when metadata is absent or reduced.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 71bf4a9b-4fe9-467f-834a-d581c45b7b50

📥 Commits

Reviewing files that changed from the base of the PR and between 30a9626 and fc0aeb2.

📒 Files selected for processing (2)

• cloudflare-worker/src/metadata.ts
• src/services/cloudflareWorkerMetadata.test.ts

🚧 Files skipped from review as they are similar to previous changes (1)

• src/services/cloudflareWorkerMetadata.test.ts

Included review availability: Your plan includes up to 8 reviews per rolling hour; 6 remain after this review.

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📝 Walkthrough

Walkthrough

The Cloudflare Worker now compacts Vectorize metadata before /upsert storage. It validates and bounds query topK values. Tests cover byte limits, UTF-8-safe truncation, field retention, and vector preservation.

Changes

Vectorize constraints

Layer / File(s)	Summary
Metadata contract and normalization cloudflare-worker/src/metadata.ts	Defines metadata shapes and byte limits. Adds UTF-8-safe truncation, input normalization, and tag compaction.
Compaction and upsert integration cloudflare-worker/src/metadata.ts, cloudflare-worker/src/index.ts, src/services/cloudflareWorkerMetadata.test.ts	Compacts oversized metadata, preserves vector properties, applies compaction during /upsert, and tests fallback and retention rules.
Query top-K validation and limit cloudflare-worker/src/index.ts, src/services/vectorSearchService.ts	Validates finite topK values, floors and clamps them to 1–50, and caps the service query request at 50.

Estimated code review effort: 4 (Complex) | ~45 minutes

Merge Risk: ⚪ Minimal · up to fc0ae

This PR compacts oversized Vectorize metadata while preserving structured fields and leaves local descriptions unchanged; no actionable merge-blocking risk remains after normal checks and review.

Sequence Diagram(s)

sequenceDiagram
  participant Client
  participant CloudflareWorker
  participant MetadataCompactor
  participant Vectorize
  Client->>CloudflareWorker: send vectors to /upsert
  CloudflareWorker->>MetadataCompactor: compact vector metadata
  MetadataCompactor-->>CloudflareWorker: return bounded metadata
  CloudflareWorker->>Vectorize: upsert compacted vectors
  Client->>CloudflareWorker: send query with topK
  CloudflareWorker->>Vectorize: query with bounded topK
  Vectorize-->>CloudflareWorker: return matches
  CloudflareWorker-->>Client: return query response

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🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the primary change: preventing oversized Vectorize metadata.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[AmintaCCCP]

复查审计总结（结合两份审计 + 实测验证）

已确认属实的问题

1. P1 — /upsert 会静默丢弃未知 metadata 字段（审计报告）
   行为属实，已实测复现：compactVectorMetadata 先 normalizeMetadata 白名单化，即使 metadata 在预算内，url/source_id 等字段也会被删除。
   • 严重性：在当前项目里不构成实际数据丢失——前端从 git 历史至今只发送 6 个字段（最早 8bcd079 起 5 字段，PR feat: 增加 repo 许可识别（License 元数据/过滤/MCP搜索） #254 加 license），查询侧只消费 full_name/description/tags（SearchBar.tsx:433），且 Worker 是带 AUTH_TOKEN 的单客户端私有代理。因此是"契约收窄"而非用户可见回归。
   • 已修复：compactVectorMetadata 现在按优先级处理——预算内原样透传全部字段；超限时先压缩 description/tags 并保留其余字段（含未知字段）；仍超限才退回 6 字段白名单（截断固定字段）。
2. P2 — 测试未覆盖 /upsert handler（审计报告）
   已修复：新增 compactUpsertVectors（纯函数、无 workers-types 依赖），并新增 handler 级测试（验证 id/values/namespace 保留、预算内 metadata 逐字节透传、超限时未知字段保留）。
3. tsconfig 类型污染（我第一轮审计）
   测试直接 import cloudflare-worker/src/index 会把依赖 workers-types 全局类型的 Worker 源码拖进 app 的 TS 程序，tsc -p tsconfig.app.json 下新增 5 个错误（TS2304 ×2、TS7006 ×3）。
   已修复：压缩逻辑抽到独立的 cloudflare-worker/src/metadata.ts（不引用 workers-types），Worker 与测试共同 import。app tsc 恢复为仅剩仓库既有的 @testing-library/user-event 缺失错误。
4. TopK 加固（顺带）
   Worker /query 改为命名常量 + 入参校验（非有限数/负数/超限优雅降级）；前端 findSimilarRepositories 的 topK + 1 余量加 Math.min(..., 50)，避免 searchTopK=50 时请求 51 被静默截断。

对存量向量的影响 / 是否需要重新索引

• 不需要。Worker 代码部署不触碰 Vectorize 索引存储；压缩只在 upsert 时生效，/query、/delete、/cleanup 路径未变，现有向量 metadata 原样保留。
• 只有此前因 40016 索引失败的仓库（metadata > 10KiB）建议重新索引一次，修复后能成功写入。
• 未改动任何增量索引逻辑：EMBEDDING_FORMAT_VERSION、needsReindex、buildEmbeddingText 均未触碰，升级后不会触发"增量索引变全量索引"。

验证结果

• 新增 metadata 测试 8 passed（含未知字段保留、handler 级用例）
• 向量服务定向 26 passed；全量前端 261 passed（RepositoryCard.test.tsx 因本地缺 @testing-library/user-event 无法收集，属既有环境问题）
• cloudflare-worker tsc、tsconfig.app.json tsc、eslint 全部通过

[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@cloudflare-worker/src/metadata.ts`:
- Around line 180-186: Update compactUpsertVectors so vectors with metadata ===
undefined retain metadata as omitted, while defined metadata continues through
compactVectorMetadata; add a regression test covering a vector without a
metadata property.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: a641b497-5285-49a6-8392-5ad06236cf5f

📥 Commits

Reviewing files that changed from the base of the PR and between 6050f08 and 30a9626.

📒 Files selected for processing (4)

• cloudflare-worker/src/index.ts
• cloudflare-worker/src/metadata.ts
• src/services/cloudflareWorkerMetadata.test.ts
• src/services/vectorSearchService.ts

Included review availability: Your plan includes up to 8 reviews per rolling hour; 7 remain after this review.