Delete row sig_a4374a2c3260 from signals

id sig_a4374a2c3260
event_id evt_402b7792f2aa
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_cfd6a9181 ...
dedupe_key signal_enriched:discovery_ipo_delta:571f15193c3410 ...
throttle_s 0
created_at 2026-04-09T07:40:05.415195+00:00
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