Delete row sig_230579ee9f4a from signals

id sig_230579ee9f4a
event_id evt_b2e1e68ffea7
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_575a4b00b ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:3d5 ...
throttle_s 0
created_at 2026-04-09T00:13:45.001978+00:00
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