Delete row sig_3f75bbf48199 from signals

id sig_3f75bbf48199
event_id evt_03051fa2b074
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_4a84deac2 ...
dedupe_key signal_enriched:discovery_ipo_delta:85d9bf27f86e0e ...
throttle_s 0
created_at 2026-04-10T08:08:24.084182+00:00
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