Implement state chronic absenteeism reporting by aggregating StudentSchoolAttendanceEvents in the Ed-Fi ODS and writing results to a custom aggregate endpoint

Steps

1. Query GET /ed-fi/studentSchoolAttendanceEvents with filters for the target school year and school; page through all results and group by studentUniqueId.
2. For each student, count total instructional days (Membership Days) from StudentSchoolAssociation session data and excused/unexcused absence days from attendance events where the category is not 'In Attendance'.
3. Calculate the absenteeism rate as (absence days / membership days) * 100; flag students at or above 10% as chronically absent per federal definition.
4. If the SEA uses an Ed-Fi extension for chronic absenteeism indicators, POST or PUT results to the extension endpoint (e.g., /ed-fi/studentAbsenteeismData) with the calculated rate and flag.
5. Schedule the aggregation job to run nightly after SIS batch attendance uploads complete; include a data freshness check to confirm today's attendance events are present before running calculations.
6. Produce a summary report by school and grade level for the SEA state reporting portal, cross-referencing with demographic data from StudentEducationOrganizationAssociation.