Delete row sig_3945eb1bd452 from signals

id sig_3945eb1bd452
event_id evt_8a9edd26b1d9
watcher_id NULL
signal_type discovery_new_listings_delta
value {"aggregator_url":"https://www.nasdaq. ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_248fd80af ...
dedupe_key signal_enriched:discovery_new_listings_delta:a4523 ...
throttle_s 0
created_at 2026-04-21T16:48:38.963204+00:00
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