Intelligent heatmap

[alexvpickering]

Description

implement downsampleSettings for heatmap expression to enable scalable but fast heatmap rendering. Uses bucketing approach (~1000cells per bucket formed by groupedTracks) for most large datasets. If sum of bucket sizes is >50K it will instead directly determine ~5K cells needed for heatmap and run an expression work request for just required cells.

Details

URL to issue

N/A

Link to staging deployment URL (or set N/A)

N/A

Links to any PRs or resources related to this PR

Integration test branch

master

Merge checklist

Your changes will be ready for merging after all of the steps below have been completed.

Code updates

Have best practices and ongoing refactors being observed in this PR

• Migrated any selector / reducer used to the new format.
• All new dependency licenses have been checked for compatibility.

Manual/unit testing

• Tested changes using InfraMock locally or no tests required for change, e.g. Kubernetes chart updates.
• Validated that current unit tests for code work as expected and are sufficient for code coverage or no unit tests required for change, e.g. documentation update.
• Unit tests written or no unit tests required for change, e.g. documentation update.

Integration testing

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will not pass the required status checks for merging.

• Started end-to-end tests on the latest commit.

Documentation updates

• Relevant Github READMEs updated or no GitHub README updates required.
• Relevant Wiki pages created/updated or no Wiki updates required.

Optional

• Staging environment is unstaged before merging.
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[dbmi-svc-checkmarx]

Checkmarx One – Scan Summary & Details – f7ec7303-3875-4dd9-acc5-90ac82f358b3

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New Issues (1)

Checkmarx found the following issues in this Pull Request

#	Severity	Issue	Source File / Package	Checkmarx Insight
1		CVE-2026-44705	Npm-tmp-0.0.33	details Recommended version: 0.2.6 Description: The tmp npm package contains a path traversal vulnerability that allows escaping the intended temporary directory when untrusted data flows into th... Attack Vector: NETWORK Attack Complexity: LOW Vulnerable Package

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[github-actions]

📦 Next.js Bundle Analysis for ui

This analysis was generated by the Next.js Bundle Analysis action. 🤖

⚠️ Global Bundle Size Increased

Page	Size (compressed)
global	685.37 KB (🟡 +506 B)

Details

The global bundle is the javascript bundle that loads alongside every page. It is in its own category because its impact is much higher - an increase to its size means that every page on your website loads slower, and a decrease means every page loads faster.

Any third party scripts you have added directly to your app using the <script> tag are not accounted for in this analysis

If you want further insight into what is behind the changes, give @next/bundle-analyzer a try!

Nine Pages Changed Size

The following pages changed size from the code in this PR compared to its base branch:

Page	Size (compressed)	First Load
/experiments/[experimentId]/data-exploration	1.47 MB (🟡 +1.77 KB)	2.14 MB
/experiments/[experimentId]/data-processing	490.42 KB (🟢 -194 B)	1.15 MB
/experiments/[experimentId]/plots-and-tables/dot-plot	447.62 KB (🟡 +1.82 KB)	1.11 MB
/experiments/[experimentId]/plots-and-tables/embedding-categorical	446.18 KB (🟢 -160 B)	1.11 MB
/experiments/[experimentId]/plots-and-tables/embedding-continuous	468.98 KB (🟡 +2.35 KB)	1.13 MB
/experiments/[experimentId]/plots-and-tables/marker-heatmap	536.89 KB (🟡 +924 B)	1.19 MB
/experiments/[experimentId]/plots-and-tables/spatial-categorical	895.48 KB (🟡 +1.77 KB)	1.54 MB
/experiments/[experimentId]/plots-and-tables/spatial-feature	898.07 KB (🟡 +2.52 KB)	1.55 MB
/experiments/[experimentId]/plots-and-tables/violin	470.25 KB (🟡 +2.51 KB)	1.13 MB

Details

Only the gzipped size is provided here based on an expert tip.

First Load is the size of the global bundle plus the bundle for the individual page. If a user were to show up to your website and land on a given page, the first load size represents the amount of javascript that user would need to download. If next/link is used, subsequent page loads would only need to download that page's bundle (the number in the "Size" column), since the global bundle has already been downloaded.

Any third party scripts you have added directly to your app using the <script> tag are not accounted for in this analysis

Next to the size is how much the size has increased or decreased compared with the base branch of this PR. If this percentage has increased by 20% or more, there will be a red status indicator applied, indicating that special attention should be given to this.

[github-actions]

📦 Next.js Bundle Analysis for ui

This analysis was generated by the Next.js Bundle Analysis action. 🤖

⚠️ Global Bundle Size Increased

Page	Size (compressed)
global	685.37 KB (🟡 +506 B)

Details

The global bundle is the javascript bundle that loads alongside every page. It is in its own category because its impact is much higher - an increase to its size means that every page on your website loads slower, and a decrease means every page loads faster.

Any third party scripts you have added directly to your app using the <script> tag are not accounted for in this analysis

If you want further insight into what is behind the changes, give @next/bundle-analyzer a try!

Nine Pages Changed Size

The following pages changed size from the code in this PR compared to its base branch:

Page	Size (compressed)	First Load
/experiments/[experimentId]/data-exploration	1.47 MB (🟡 +1.77 KB)	2.14 MB
/experiments/[experimentId]/data-processing	490.42 KB (🟢 -194 B)	1.15 MB
/experiments/[experimentId]/plots-and-tables/dot-plot	447.62 KB (🟡 +1.82 KB)	1.11 MB
/experiments/[experimentId]/plots-and-tables/embedding-categorical	446.18 KB (🟢 -160 B)	1.11 MB
/experiments/[experimentId]/plots-and-tables/embedding-continuous	468.98 KB (🟡 +2.35 KB)	1.13 MB
/experiments/[experimentId]/plots-and-tables/marker-heatmap	536.89 KB (🟡 +924 B)	1.19 MB
/experiments/[experimentId]/plots-and-tables/spatial-categorical	895.48 KB (🟡 +1.77 KB)	1.54 MB
/experiments/[experimentId]/plots-and-tables/spatial-feature	898.07 KB (🟡 +2.52 KB)	1.55 MB
/experiments/[experimentId]/plots-and-tables/violin	470.25 KB (🟡 +2.51 KB)	1.13 MB

Details

Only the gzipped size is provided here based on an expert tip.

First Load is the size of the global bundle plus the bundle for the individual page. If a user were to show up to your website and land on a given page, the first load size represents the amount of javascript that user would need to download. If next/link is used, subsequent page loads would only need to download that page's bundle (the number in the "Size" column), since the global bundle has already been downloaded.

Any third party scripts you have added directly to your app using the <script> tag are not accounted for in this analysis

Next to the size is how much the size has increased or decreased compared with the base branch of this PR. If this percentage has increased by 20% or more, there will be a red status indicator applied, indicating that special attention should be given to this.