Delete row sig_5b8b6214a844 from signals

id sig_5b8b6214a844
event_id evt_55d828b97123
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_51e1a362d ...
dedupe_key signal_enriched:discovery_new_listings_delta:1881e ...
throttle_s 0
created_at 2026-04-22T13:12:40.941923+00:00
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