Delete row sig_1441a007a01d from signals

id sig_1441a007a01d
event_id evt_1f673610f783
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_6bdeb43c7 ...
dedupe_key signal_enriched:discovery_new_listings_delta:bc908 ...
throttle_s 0
created_at 2026-04-22T11:09:42.515872+00:00
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