Delete row sig_37564b66542d from signals

id sig_37564b66542d
event_id evt_38bc6e94de5c
watcher_id NULL
signal_type discovery_ipo_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_50be8c258 ...
dedupe_key signal_enriched:discovery_ipo_delta:7c43dd56ec2840 ...
throttle_s 0
created_at 2026-04-20T07:05:40.083399+00:00
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