Delete row sig_309eadad0cf8 from signals

id sig_309eadad0cf8
event_id evt_5783a8105900
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_58eb2a196 ...
dedupe_key signal_enriched:discovery_new_listings_delta:a3a3b ...
throttle_s 0
created_at 2026-04-20T13:10:00.946643+00:00
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