May 2026 monthly summary highlighting key features delivered, major bug fixes, and overall impact across cctbx projects. Implemented reproducible MPI-based reflection selection, introduced bootstrap subsampling for lattice replicates, and added a lookup cache to accelerate data retrieval. Expanded XTC spectrometer data handling and event-code encoding in dxtbx, and enhanced XFEL timestamp handling for robust data association and logging. These efforts improve reproducibility, processing performance, and data integrity, enabling more reliable structure refinement workflows and smoother cross-repo integration with dxtbx.

January 2026: Focused on quality and correctness in cctbx_project. No new features delivered this month; major effort centered on bug fixes and reliability improvements. Key action: disabled the transverse vs radial displacement visualization in the Detector Residuals plotting to prevent incorrect or misleading plots, safeguarding data integrity for detector residual analyses and downstream workflows.

December 2025 monthly summary: Delivered cross-repo Psana2 integration enabling robust LCLS/LCLS-II data processing across cctbx_project, dxtbx, and dials. Implemented MPI-aware data loading, zero-length imagesets, and psana1/psana2 compatibility, aligning with Psana2 migration work. Stabilized XFEL GUI by pinning MySQL 8, and hardened job submission (handling missing queue, param rename, and TDER edge cases). These changes improve reliability, scalability, and data accessibility for high-throughput XFEL experiments, and accelerate adoption of psana2 workflows. Relevant PRs: #1111, #860, #3038.

November 2025 monthly summary focusing on key accomplishments across cctbx_project, dials, and nexusformat_definitions. Delivered clear workflow improvements, stability enhancements, reproducible data processing, and streamlined contribution processes that translate to faster development cycles, more accurate results, and stronger collaboration.

Month: 2025-10 — XFEL CI Dependency Resolution Stabilization in cctbx/cctbx_project. Focused on deterministic dependency resolution and CI reliability to reduce build failures and improve developer velocity. Implemented strategies to standardize environments and prevent CI fragility, delivering measurable improvements in build reliability and reproducibility across XFEL-related workflows.

Month 2025-09: Delivered key XFEL GUI enhancements in cctbx/cctbx_project focusing on stability, calibration accuracy, and data-quality improvements. Implemented psana2-based fee calibration, added an energy filter to improve merging of XFEL experiments, and enhanced run statistics visualization with auto-clipping and SLURM OOM tracking. Performed targeted bug fixes and minor improvements across modules to stabilize workflows and improve user experience. These changes reduce data-processing friction, improve merging reliability, and strengthen monitoring of compute resources.

August 2025 monthly summary for cctbx/cctbx_project: Implemented synchronization of the xfel/euxfel/definitions subproject with the latest nexusformat/definitions to align with upstream changes, ensuring current definitions and reducing downstream drift. This work strengthens interoperability across the xfel/euxfel components and nexusformat, paving the way for stable downstream feature work and easier maintenance. No critical bugs were reported this month; ongoing health checks indicate improved compatibility and future-proofing of the definitions layer.

July 2025 monthly summary: Stabilized multiprocessing paths in dials/dials by delivering a critical bug fix for the Stills Process Command-Line Tool. Ensured the debug file handle is properly closed and deleted after use in multiprocessing mode, eliminating resource leaks and preventing intermittent errors during long-running processing. The fix, tracked under #2995, was implemented in commit 398450e380cffacbfbbe00294e16a2268df8c55b. Impact: improved reliability and predictability of automated runs, reduced support tickets related to resource leaks, and preserved data integrity across pipelines.

May 2025 monthly summary for cctbx_project: Delivered UX and stability improvements to the XFEL GUI and updated environment packaging. Achievements include GTK3 compatibility and layout improvements, environment maintenance with hatchling, and a bug fix to the hit rate statistics query ensuring correct averaging.

April 2025 monthly summary focused on delivering higher reliability, performance, and data quality across the DIALS, cctbx, and dxtbx stack. Key contributions spanned robustness for long-running pipelines, parallel execution enhancements, and richer data logging and sensor modeling to improve scientific throughput and decision-making.

February 2025 monthly summary: Delivered targeted optimizations and improved governance documentation across two repositories. Achieved faster CI feedback and reduced resource usage by removing redundant XFEL tests; and refreshed funding disclosures in DIALS to reflect current grants and support, accompanied by a news fragment for visibility. No major bugs fixed this month. These efforts strengthened operational efficiency, transparency, and maintainability, with hands-on work in CI/CD, documentation, and cross-repo collaboration.

Month: 2025-01 — This cycle focused on stabilizing CI/CD, improving cross-version compatibility, and enhancing data-model flexibility across two repos. The work delivered business-value through reproducible builds, reduced environment drift, and smoother downstream testing.

December 2024 monthly summary focusing on business value and technical achievements across two repositories. Delivered build reliability enhancements and flexible data-model changes to support broader use-cases and easier onboarding.

2024-11 Monthly Summary for dials/dials: Implemented a targeted DIALS website content update to improve project transparency and research visibility. The update adds a high-level About page overview with citation information and expands the Publications page with XFEL publications to showcase contributions.

For 2024-10, delivered NXmx Nexus Detector Gain Reading Enhancement in cctbx/dxtbx, introducing the data_scale_factor parameter to NXmx format functionality, enabling reading detector gain for Nexus files and improving calibration data workflows. Commit reference: 834cb48e0f8787a875be6621edbe291efbbf4d3e.