Delete row sig_464626953881 from signals

id sig_464626953881
event_id evt_ab6f4b10898a
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_41a0ffc3d ...
dedupe_key signal_enriched:discovery_ipo_delta:ba99f7fafe8f13 ...
throttle_s 0
created_at 2026-04-11T13:38:22.073620+00:00
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