Delete row sig_400ef95c78bf from signals

id sig_400ef95c78bf
event_id evt_a3d1698c9788
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_bfb15550b ...
dedupe_key signal_enriched:discovery_new_listings_delta:883cd ...
throttle_s 0
created_at 2026-04-11T15:08:00.060011+00:00
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