Delete row sig_02f6f42216df from signals

id sig_02f6f42216df
event_id evt_f5982057c079
watcher_id NULL
signal_type discovery_unusual_volume_delta
value {"aggregator_url":"https://www.nasdaq. ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_8c5e8d30e ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:a46 ...
throttle_s 0
created_at 2026-04-05T14:04:42.533552+00:00
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