Delete row sig_b7eca6306092 from signals

id sig_b7eca6306092
event_id evt_23d6f8f7cdfa
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_9ae4685dd ...
dedupe_key signal_enriched:discovery_new_listings_delta:bfcbb ...
throttle_s 0
created_at 2026-04-08T19:57:42.365437+00:00
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