Schumann history with source-aware separation between the accumulated external Near Live activity series and verified historical ELF reference data. Measured F1-F4 history appears only when an approved source explicitly supplies measured values.
History preserves record time, source and quality
A historical chart is not a bag of anonymous points. Each series is bound to metric_id, source_id, station_id and observed_at and passes quality filtering. Out-of-range or otherwise unusable records should not distort chart minimum, maximum or trend merely because they existed in a raw upstream feed.
Changing chart range does not change metric meaning
Time-range controls expose short and longer context. Chart downsampling is designed to preserve meaningful extremes without creating new observations. Relative activity 0-100 remains derived analysis, while physical frequency in Hz remains a separate metric. Combining them on one unlabeled scale would be incorrect.
History is not automatically a forecast
A repeating pattern may be interesting for analysis, but it is not itself a predictive model. GeoLira does not infer health, psychological outcomes or certain future events from Schumann history. Interpretation must account for station quality, time coverage and possible artifacts.