[richiemcilroy]

Folders with more than 50 caps render no thumbnails, and their view counts read 0.

• Every VideoThumbnail and useVideosAnalyticsQuery request goes through a dataloader that collects everything issued in a 10 ms window into one RPC.
• VideosGetThumbnails and VideosGetAnalytics both reject payloads over 50 ids (packages/web-domain/src/Video.ts:381). Folder pages are not paginated, so a 51-cap folder sends a 51-id batch, the client-side payload schema fails, and every request in the batch fails.
• Thumbnails fall back to the gray error gradient. Analytics failures are caught per video and become { count: 0 }.
• With 51 to roughly 100 caps, thumbnails can show up after react-query's retries, because retries sometimes land in smaller batches. Larger folders never recover.

The fix sets maxBatchSize: 50 on both dataloaders (apps/web/lib/Requests/ThumbnailRequest.ts:47, apps/web/lib/Requests/AnalyticsRequest.ts:45), so a full batch flushes immediately and the next request opens a new one.

flowchart LR
  subgraph Before
    A[600 cards mount] --> B[one batch, 600 ids] --> C[payload schema fails] --> D[600 failures]
  end
  subgraph After
    E[600 cards mount] --> F[12 batches of 50] --> G[12 RPCs] --> H[600 results]
  end

Loading

Pages with 50 or fewer cards, such as /dashboard/caps (15 per page) and paginated space pages, still send a single batch. Their behaviour is unchanged.

Before / after

51-cap folder, 3 s after load:

Before	After

Numbers

Production builds of main and this branch on a Mac mini. Both run against the same seeded MySQL and MinIO, with injected round-trip latency (4 ms to the database, 20 ms to S3). Headless Chromium, cold load, median of 5 runs, base and head alternating.

Page	Metric	main	this PR
Folder, 51 caps	first thumbnail	7,692 ms	705 ms
Folder, 51 caps	visible thumbnails settled	7,938 ms	888 ms
Folder, 600 caps	first thumbnail	never	1,496 ms
/dashboard/caps, 15 cards	first thumbnail	522 ms	533 ms (noise)

Confidence Score: 5/5

The PR appears safe to merge; no blocking issues were found.

Summary

Caps thumbnail and analytics batches at 50 video IDs to match both RPC limits.

• Large video lists fetch thumbnails and counts in batches of 50.

_{Reviews (2) · Last reviewed commit: "fix(web): cap thumbnail and analytics ba..." · Reviewed by Greptile}

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1 Skipped Deployment

Project	Deployment	Actions	Updated
cap-status	Skipped		Oct 28, 2026 11:49pm UTC

[richiemcilroy]

hey @greptileai, please re-review the PR

[capy-ai]

Capy found no issues.