Delete row sig_4a9138e770ab from signals

id sig_4a9138e770ab
event_id evt_782f6d993f27
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_c4ee21efd ...
dedupe_key signal_enriched:discovery_new_listings_delta:3e865 ...
throttle_s 0
created_at 2026-04-14T10:11:17.846354+00:00
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