Search by Event / Forensic Search — One-Page Reference

What search by event is (querying a metadata index built at record time, not the pixels) and how the pipeline works (camera/analytics -> ONVIF Profile M -> VMS index -> query -> ranked results); the governing principle (you can only find what was indexed; reprocessing fills gaps but is slow and needs the raw footage retained); the five search rungs (time+camera, motion region, event/object, attribute, appearance, natural language) with the metadata/compute/privacy each needs; the ONVIF boundary