Delete row sig_53bf0c4ef8c4 from signals

id sig_53bf0c4ef8c4
event_id evt_6bc19319edc6
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_8c5375b12 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:e13 ...
throttle_s 0
created_at 2026-04-19T15:45:47.773233+00:00
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