Delete row sig_259ca3367abf from signals

id sig_259ca3367abf
event_id evt_6abf538fcced
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_070ad463a ...
dedupe_key signal_enriched:discovery_new_listings_delta:23835 ...
throttle_s 0
created_at 2026-04-22T14:13:37.135360+00:00
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