Delete row sig_b4715516f5e6 from signals

id sig_b4715516f5e6
event_id evt_6babda7fe8e7
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_bcd7a81d3 ...
dedupe_key signal_enriched:discovery_new_listings_delta:64c86 ...
throttle_s 0
created_at 2026-04-09T09:09:23.106819+00:00
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