Delete row sig_987f6f05b51a from signals

id sig_987f6f05b51a
event_id evt_3050c71bd94d
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_74f890a62 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:249 ...
throttle_s 0
created_at 2026-04-19T11:16:24.661615+00:00
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