Delete row sig_64aaa968c442 from signals

id sig_64aaa968c442
event_id evt_5bbb6f9147c3
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_8191e9a5c ...
dedupe_key signal_enriched:discovery_new_listings_delta:c4907 ...
throttle_s 0
created_at 2026-04-20T13:10:00.946643+00:00
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