AMMP's historic KPI data for every tracked site, exactly as AMMP returns it: one row per asset per 15-minute date, AMMP's field names, AMMP's units, and nested data such as tags or data_provider as the JSON AMMP sent. A series' members are columns named by their path, for example pv_power.unit. Every night new readings are pulled from AMMP and the table is rebuilt, and the new copy replaces the old one in a single step, so Power BI never reads a half-built table.