Delete row sig_7cb9a4d2fdfd from signals

id sig_7cb9a4d2fdfd
event_id evt_c0e2945f2559
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_61ae610dc ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:950 ...
throttle_s 0
created_at 2026-04-21T16:48:38.963204+00:00
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