fix: Increase batch scheduler max new items limit

[juliusgeo]

Description

Increase it so that the batch scheduler doesn't fall over when there are more than 1k tasks per second.

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Documentation change (pure documentation change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (non-breaking changes to code which doesn't change any behaviour)
• CI (any automation pipeline changes)
• Chore (changes which are not directly related to any business logic)
• Test changes (add, refactor, improve or change a test)
• This change requires a documentation update

What's Changed

• Add a list of tasks or features here...

Checklist

Changes have been:

• Tested (unit, integration, or manually with steps specified)
• Linted and formatted
• Documented (where applicable)
• Added to CHANGELOG (where applicable) -- see Keep a Changelog

---

🤖 AI Disclosure

• I acknowledge that an LLM was used in the creation of this Pull Request, in accordance with Hatchet's AI_POLICY.md.

• Details: [e.g. generating tests, writing docs]

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Project	Deployment	Actions	Updated (UTC)
hatchet-docs	Ready	Preview, Comment	Jul 28, 2026 12:01am

[github-actions]

Benchmark results

goos: linux
goarch: amd64
pkg: github.com/hatchet-dev/hatchet/pkg/scheduling/v1
cpu: AMD Ryzen 9 7950X3D 16-Core Processor          
                                         │ /tmp/old.txt │            /tmp/new.txt            │
                                         │    sec/op    │    sec/op     vs base              │
BatchSchedulerWorstCaseMemory-8             1.507 ±  6%    1.578 ±  6%       ~ (p=0.180 n=6)
RateLimiter-8                              48.46µ ± 12%   47.07µ ± 13%       ~ (p=0.818 n=6)
Scheduler_Replenish_DenseSharedActions-8   14.19m ±  2%   14.20m ±  3%       ~ (p=0.818 n=6)
geomean                                    10.12m         10.18m        +0.59%

                                │ /tmp/old.txt │         /tmp/new.txt          │
                                │  bytes/item  │ bytes/item  vs base           │
BatchSchedulerWorstCaseMemory-8     70.17 ± 0%   70.17 ± 0%  ~ (p=1.000 n=6) ¹
¹ all samples are equal

                                │ /tmp/old.txt  │           /tmp/new.txt           │
                                │ worst_case_MB │ worst_case_MB  vs base           │
BatchSchedulerWorstCaseMemory-8     1.403k ± 0%     1.403k ± 0%  ~ (p=1.000 n=6) ¹
¹ all samples are equal

                                │   /tmp/old.txt   │           /tmp/new.txt            │
                                │ worst_case_bytes │ worst_case_bytes  vs base         │
BatchSchedulerWorstCaseMemory-8        1.403G ± 0%        1.403G ± 0%  ~ (p=0.197 n=6)

                                         │ /tmp/old.txt │            /tmp/new.txt            │
                                         │     B/op     │     B/op      vs base              │
BatchSchedulerWorstCaseMemory-8            6.400Gi ± 0%   6.400Gi ± 0%       ~ (p=0.485 n=6)
RateLimiter-8                              137.7Ki ± 0%   137.7Ki ± 0%       ~ (p=0.790 n=6)
Scheduler_Replenish_DenseSharedActions-8   11.69Mi ± 0%   11.69Mi ± 0%       ~ (p=0.485 n=6)
geomean                                    21.76Mi        21.76Mi       -0.00%

                                         │ /tmp/old.txt │            /tmp/new.txt             │
                                         │  allocs/op   │  allocs/op   vs base                │
BatchSchedulerWorstCaseMemory-8             3.727k ± 0%   3.720k ± 0%       ~ (p=0.095 n=6)
RateLimiter-8                               1.022k ± 0%   1.022k ± 0%       ~ (p=1.000 n=6) ¹
Scheduler_Replenish_DenseSharedActions-8    17.52k ± 0%   17.52k ± 0%       ~ (p=0.351 n=6)
geomean                                     4.056k        4.054k       -0.05%
¹ all samples are equal

_{Compared against main (559b502)}