Delete row sig_346ed8f88a7e from signals

id sig_346ed8f88a7e
event_id evt_b207f4860c3b
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_60afa1ca0 ...
dedupe_key signal_enriched:discovery_new_listings_delta:2c1a3 ...
throttle_s 0
created_at 2026-04-20T20:32:04.855080+00:00
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