Delete row sig_761d757631ff from signals

id sig_761d757631ff
event_id evt_732e45d6c760
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_4c1be272f ...
dedupe_key signal_enriched:discovery_ipo_delta:aa208a1c763deb ...
throttle_s 0
created_at 2026-04-09T10:38:52.980302+00:00
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