Delete row sig_5884e475e23c from signals

id sig_5884e475e23c
event_id evt_bbf2c5b8da6b
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_4193291f5 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:90b ...
throttle_s 0
created_at 2026-04-20T01:00:47.909969+00:00
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