Delete row sig_0459f17326b2 from signals

id sig_0459f17326b2
event_id evt_877972dc7783
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_3cb7750f9 ...
dedupe_key signal_enriched:discovery_ipo_delta:dd824fe54e943a ...
throttle_s 0
created_at 2026-04-17T06:43:47.830423+00:00
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