Delete row sig_4fcfbc8013a1 from signals

id sig_4fcfbc8013a1
event_id evt_d8e7483b327c
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_fb0b63946 ...
dedupe_key signal_enriched:discovery_new_listings_delta:5c3c5 ...
throttle_s 0
created_at 2026-04-08T10:33:26.208520+00:00
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