Delete row sig_a2c42d3c40e3 from signals

id sig_a2c42d3c40e3
event_id evt_e5986824dc09
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_fe7aa07c6 ...
dedupe_key signal_enriched:discovery_new_listings_delta:ebabb ...
throttle_s 0
created_at 2026-04-09T10:38:52.980302+00:00
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