Delete row sig_2183a95d327f from signals

id sig_2183a95d327f
event_id evt_8e940ccceab7
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_87d1be65a ...
dedupe_key signal_enriched:discovery_new_listings_delta:d0640 ...
throttle_s 0
created_at 2026-04-14T13:14:01.410660+00:00
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