Delete row sig_f4676f8aa167 from signals

id sig_f4676f8aa167
event_id evt_7997f343e1f5
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_760f1bd16 ...
dedupe_key signal_enriched:discovery_new_listings_delta:fc7f4 ...
throttle_s 0
created_at 2026-04-22T14:13:37.135360+00:00
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