Delete row sig_b237363d3112 from signals

id sig_b237363d3112
event_id evt_53485f51428a
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_3fc36fc3a ...
dedupe_key signal_enriched:discovery_new_listings_delta:48c33 ...
throttle_s 0
created_at 2026-04-10T17:21:18.772571+00:00
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