Delete row sig_8dfe09bba442 from signals

id sig_8dfe09bba442
event_id evt_de0cd02f6e75
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_1c7dac652 ...
dedupe_key signal_enriched:discovery_new_listings_delta:709eb ...
throttle_s 0
created_at 2026-04-22T07:06:43.381459+00:00
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