Monthly summary for 2025-05 focusing on business value and technical achievements for JeffersonLab/halld_recon. Key feature delivered: Adaptive Circular Monitor Fit and Histogram Rebinning. The feature dynamically selects the fit model for circular monitor data, switching between a simple sine model and a richer model based on total histogram entries, and introduces adaptive histogram rebinning by a factor of 2 when data is sparse. This improves fitting performance and responsiveness in low-statistics datasets, enabling faster and more reliable quality checks for downstream analyses. No major bugs fixed this month. Overall impact: Enhanced monitoring accuracy and speed in challenging data regimes, contributing to higher data quality and quicker feedback loops for production and research workflows. Maintains pipeline stability while delivering a notable performance and robustness uplift. Technologies/skills demonstrated: dynamic model selection logic, adaptive histogram rebinning, low-statistics data handling, performance optimization, and integration into the halld_recon monitoring workflow.

April 2025 monthly summary for JeffersonLab/halld_recon: Delivered end-to-end circular polarization monitoring for the p2pi plugin, enabling polarization studies of rho mesons. Implemented histogram-based tracking of azimuthal decay angle with gating on beam helicity and kinematic cuts, plus a plotting macro to visualize measurements and calculate helicity asymmetry. Fixed histogram path resolution in HistMacro_CircMonitor by updating base path to p2pi_preco and prepending Custom_p2pi_hists/ to histogram names, improving macro reliability. These changes enhance physics analysis capabilities, reduce debugging time, and improve maintainability of polarization-related histograms and macros.