Delete row sig_462010f0555e from signals

id sig_462010f0555e
event_id evt_1d8989a5d08c
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_717098035 ...
dedupe_key signal_enriched:discovery_new_listings_delta:ff8d0 ...
throttle_s 0
created_at 2026-04-13T18:15:55.373957+00:00
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