Delete row sig_1f15a7c100fe from signals

id sig_1f15a7c100fe
event_id evt_3b166bd94e12
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_794dcdd82 ...
dedupe_key signal_enriched:discovery_new_listings_delta:f8b1b ...
throttle_s 0
created_at 2026-04-21T13:49:56.265209+00:00
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