Delete row sig_37ace92810eb from signals

id sig_37ace92810eb
event_id evt_c296c16782a0
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_cd256b174 ...
dedupe_key signal_enriched:discovery_ipo_delta:95c6761f3828e4 ...
throttle_s 0
created_at 2026-04-17T12:43:12.563342+00:00
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