[markijbema]

Summary

• Converts the empty model_experiment_request ledger introduced by feat(gateway): route and persist model experiments #3325 into a PostgreSQL monthly range-partitioned table so experiment attribution and future retention operations scale with preview traffic.
• Uses the partition-compatible (usage_id, created_at) primary key while preserving request attribution foreign keys, constraints, and reporting/feedback indexes.
• Adds monthly partition maintenance with a rolling three-month provisioned window, following the exa_usage_log pattern without creating fallback rows that need operational relocation.

Verification

• Applied the new migration against a fresh local development PostgreSQL database and confirmed it completes successfully.

Visual Changes

N/A

Reviewer Notes

• The migration intentionally drops and recreates model_experiment_request because the table is currently empty; there is no data-copy phase.
• Drizzle models the new composite primary key, but does not represent PostgreSQL PARTITION BY or child partitions in its snapshot; the migration follows the existing exa_usage_log physical-DDL precedent.
• If monthly provisioning is missed beyond the forward window, experiment attribution persistence fails visibly through its existing best-effort error reporting while billing remains unaffected; the table does not silently collect rows outside monthly partitions.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

The latest commit removes the default partition entirely (both the DDL and the monitoring check), eliminating any risk of stranded rows accumulating silently. Out-of-window inserts now fail immediately and visibly. No issues found across all reviewed files.

Files Reviewed (6 files)

• apps/web/src/app/api/cron/model-experiment-request-partition-maintenance/route.ts — no issues (default-partition check removed cleanly; unused captureMessage import also removed)
• packages/db/src/migrations/0142_dashing_blue_marvel.sql — no issues (default partition DDL removed)
• apps/web/vercel.json — no issues
• packages/db/src/migrations/meta/0142_snapshot.json — no issues (generated)
• packages/db/src/migrations/meta/_journal.json — no issues (generated)
• packages/db/src/schema.ts — no issues

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_{Reviewed by claude-sonnet-4.6 · 191,163 tokens}

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