Delete row sig_6e399015ee97 from signals

id sig_6e399015ee97
event_id evt_651c728f891b
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_6bd3b5aac ...
dedupe_key signal_enriched:discovery_new_listings_delta:2aab2 ...
throttle_s 0
created_at 2026-04-08T06:31:07.641041+00:00
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