Delete row sig_ef0558625b1a from signals

id sig_ef0558625b1a
event_id evt_69a4b63c5f2c
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_f32f13003 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:160 ...
throttle_s 0
created_at 2026-04-19T20:14:07.003061+00:00
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