March 2026 (2026-03) monthly summary for uhh-cms/cmsdb. Focused on stabilizing the data processing pipeline and ensuring consistent prompt management. No new customer-facing features were released this month; primary effort concentrated on bug fixes and reliability improvements that enhance data integrity and downstream analytics.

February 2026 Monthly Summary (uhh-cms/cmsdb): Delivered targeted CMS data ecosystem upgrades for 2024, enabling faster analytics and higher data quality for parking data assets. Key deliverables include VBF and HH parking datasets for 2024, a new data_hh processing path, and comprehensive dataset definition lint cleanup to ensure consistency across data assets. The work is underpinned by three commits that implemented these changes, providing clear traceability and maintainability across the data pipeline.

Summary for 2025-09: Focused on improving accuracy and consistency of cross-section calculations in the cmsdb EWK module. Delivered a refined cross-section parameterization using an additive scheme for the dy and w_lnu processes, aligning cmsdb parameters with refined precision. No critical bugs reported; work centered on feature delivery and validation readiness. This work enhances predictive accuracy for CMS analyses and reduces scale and PDF uncertainties in downstream workflows.

Month: 2025-08 – Focused on delivering a consolidated post-campaign dataset refresh in the cmsdb repository to support 2022 analyses (signals, top quark, Drell-Yan). Key features delivered include a unified update workflow and dataset consolidation for post-campaign data, incorporating new signal datasets, refined top-quark options, and corrected/merged Drell-Yan samples. The work also streamlined dataset maintenance by removing obsolete bbWW-related datasets and explicitly recording changes for reproducibility. Commit references demonstrate traceability and intent behind each change: - cc78c55f79942a8cae3f127bd394c943bf55193c: add signal datasets 2022post new campaign - d1a2580a3cda492bad5b72cd76ebb7786411b335: add top datasets, comment out bbWW datasets - 7ca52e8a37b9d7b934dfd78f6dec4cd8c3cfc45e: update ewk samples 2022 post

July 2025 — Focused improvements to CMSDB cross-section pipeline: (1) VBF cross-section upgrade with N3LO k-factor applied to hh_vbf_k_13p6 for relevant processes to improve consistency and accuracy; (2) CMSDB cross-section value correction at 13.6 TeV from 6.719 to 671.9 to reflect correct units and calculation. These changes enhance analysis reliability, data integrity, and reproducibility.

January 2025 monthly summary focusing on delivered value, key features, and reliability improvements across two repositories. Highlights include targeted dataset configuration work for single top quark production in the 2022 postEE campaign, and critical fixes to histogram merging correctness that directly impact physics analysis workflows and data quality.

December 2024 monthly summary focusing on key accomplishments and business value across the two repositories. Key features delivered include dictionary-based initialization for SF configuration loading across btag, electron, and muon modules, enabling more flexible and reproducible configuration management. In cmsdb, expanded Z_qq and single top datasets for the 2023 pre-BPix run, adding diverse configurations and variations (different PT ranges, decay channels, and generator variations) to broaden physics analysis coverage. No major bug fixes were documented for this period. Overall impact includes improved configurability, faster onboarding for new analyses, and stronger data curation practices. Technologies and skills demonstrated include Python dictionary-based config handling, modular configuration design, dataset curation, and version-controlled development across multiple modules.

Month: 2024-11 This period focused on strengthening trigger weight capabilities and stabilizing dataset configuration, delivering features that enable more accurate physics analyses and smoother data processing workflows across two key repositories. Key features delivered: - Trigger Weight System Enhancement in columnflow/columnflow: refactored electron weight producer to correctly handle systematic variations and introduced a new electron trigger weight producer; added a muon trigger weight producer to extend trigger performance coverage. Commit: dfe5c7fce547ecf7bae653b2f4c25c8181cd9e36. - Dataset configuration updates in uhh-cms/cmsdb: added a new single muon dataset for 2022 pre-EE run C (run3_2022_preEE_nano_uhh_v12), updating paths, totals, and introducing a new nominal_ext1 merging factor; aligned and swapped key order for nominal datasets as part of configuration cleanup. Commits: 79c36fa80c08290cb08f7f10ea67aa8c1b7b83a7; ac5dbf57a982f56a681a7743aa3696611f6c5446. Major bugs fixed: - No critical bugs reported this month. Improvements focused on feature delivery and configuration reliability, including robust handling of systematics in weight producers and alignment of dataset configurations to prevent misconfigurations between nominal and nominal_ext1. Overall impact and accomplishments: - Improved physics analysis readiness through systematics-aware trigger weights and more reliable dataset configurations, reducing risk of misconfiguration and enabling reproducible results. - Enhanced cross-repo collaboration between columnflow and cmsdb, with explicit, traceable commits that support faster onboarding and review for future changes. Technologies/skills demonstrated: - Systematics-aware data processing and weight production - Dataset configuration management and versioned changes - Cross-repo coordination and maintainable codebase practices