A WellGroupMember record is created each time a MonitoringWell is added to a WellGroup. The record carries the groupId and wellId as its key references. Because membership is a separate join model, a single well can belong to several groups simultaneously — for example, appearing in both an "Upgradient" group and a "Source Zone" group. Group membership drives which wells appear in group-scoped trend charts and tabular reports.
Technical section
Data model, API, and internals — visible to developers.