Delete row sig_18c45389c945 from signals

id sig_18c45389c945
event_id evt_cca3016e1b65
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_3a5dad3b5 ...
dedupe_key signal_enriched:discovery_new_listings_delta:9d63f ...
throttle_s 0
created_at 2026-04-09T21:31:27.529333+00:00
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