Delete row sig_45659cbc3ebd from signals

id sig_45659cbc3ebd
event_id evt_90584c1ab050
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_8051a02ad ...
dedupe_key signal_enriched:discovery_ipo_delta:5b78c50b286b36 ...
throttle_s 0
created_at 2026-04-09T00:13:45.001978+00:00
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