Delete row sig_4906037e952c from signals

id sig_4906037e952c
event_id evt_4aceae50b5a3
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_ab6d7ab70 ...
dedupe_key signal_enriched:discovery_new_listings_delta:2d4fb ...
throttle_s 0
created_at 2026-04-17T14:13:05.509159+00:00
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