Delete row sig_77a09b820a40 from signals

id sig_77a09b820a40
event_id evt_67ec646f8de9
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_bd94fa6ab ...
dedupe_key signal_enriched:discovery_new_listings_delta:45426 ...
throttle_s 0
created_at 2026-04-10T08:08:24.084182+00:00
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