Delete row sig_2bcf6647eb54 from signals

id sig_2bcf6647eb54
event_id evt_c645d12b0132
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_dca75c9fe ...
dedupe_key signal_enriched:discovery_new_listings_delta:c5c8f ...
throttle_s 0
created_at 2026-04-21T13:49:56.265209+00:00
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