Delete row sig_461527ed77e1 from signals

id sig_461527ed77e1
event_id evt_e0b784d56c9d
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_d8ba74901 ...
dedupe_key signal_enriched:discovery_ipo_delta:17cd032409f2d4 ...
throttle_s 0
created_at 2026-04-10T22:42:10.560858+00:00
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