Delete row sig_617d28be734a from signals

id sig_617d28be734a
event_id evt_94d25f3a07c1
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_aedf293ef ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:1a7 ...
throttle_s 0
created_at 2026-04-09T15:06:58.940339+00:00
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