kairusama/call-report-one

Call Report One数据集是由配套ETL控制面板Space生成的季度FFIEC呼叫报告快照。数据源是FFIEC CDR批量下载页面（`ReportingSeriesSinglePeriod`），每次成功运行会为选定的报告期写入一个规范的parquet文件。Quarterly FFIEC Call Report snapshots produced by the companion ETL control panel Space. The source is the FFIEC CDR bulk download page (`ReportingSeriesSinglePeriod`) and each successful run writes one canonical parquet for the selected reporting period.