Remove model experiment maintenance

[chrarnoldus]

Summary

• remove the unused model-experiment request partition provisioner and cron route
• remove the Vercel schedule and Jest partition setup
• remove the obsolete soft-delete retention fixture and documentation

Database safety

• retains all four model-experiment tables and schema declarations
• adds, removes, or modifies no database migration, snapshot, or journal artifact
• based on the full revert in PR Revert "Drop model experiment tables" #6685 after the table-drop migration failed

Validation

• confirmed packages/db has no diff
• formatting and git diff --check
• local tests skipped; CI will validate the cleanup

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

Pure deletion of the unused model-experiment request partition provisioner, its cron route, Jest coverage, and the Vercel schedule; no in-repository writer to model_experiment_request remains, so the removal introduces no runtime or data-integrity defect.

Files Reviewed (7 files)

• apps/web/src/app/api/cron/model-experiment-request-partition-maintenance/route.ts - deleted cron route
• apps/web/src/lib/model-experiment-request-partitions.test.ts - deleted unit test
• apps/web/src/lib/model-experiment-request-partitions.ts - deleted provisioner
• apps/web/src/lib/user/index.test.ts - removed experiment fixture imports, cleanup deletes, and soft-delete retention test
• apps/web/src/lib/user/index.ts - removed stale retention doc bullet
• apps/web/src/tests/setup/workerSetup.ts - removed partition provisioning call
• apps/web/vercel.json - removed cron schedule entry

Verified: no remaining references to provisionModelExperimentRequestPartitions or the removed cron path; import lists and vercel.json remain syntactically valid; the retained partitioned model_experiment_request table has no in-repo writer today, so dropping its maintenance window is safe.

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_{Reviewed by deepseek-v4.1-flash · Input: 0 · Output: 0 · Cached: 0}

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