Delete row sig_1cb6061b61f9 from signals

id sig_1cb6061b61f9
event_id evt_7b486628e00d
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_14074770b ...
dedupe_key signal_enriched:discovery_new_listings_delta:76a1e ...
throttle_s 0
created_at 2026-04-10T12:11:33.277556+00:00
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