Delete row sig_8e16dcc74412 from signals

id sig_8e16dcc74412
event_id evt_f7528affa287
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_ba0664a95 ...
dedupe_key signal_enriched:discovery_new_listings_delta:79bf8 ...
throttle_s 0
created_at 2026-04-14T13:14:01.410660+00:00
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