Delete row sig_2054e292c160 from signals

id sig_2054e292c160
event_id evt_16ab4d291e64
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_f5d295449 ...
dedupe_key signal_enriched:discovery_new_listings_delta:9d3c8 ...
throttle_s 0
created_at 2026-04-11T06:09:52.040255+00:00
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