Delete row sig_d8eabdd8c499 from signals

id sig_d8eabdd8c499
event_id evt_d7f1070256a8
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_ecf6d4756 ...
dedupe_key signal_enriched:discovery_ipo_delta:98808a1716a7b5 ...
throttle_s 0
created_at 2026-04-16T07:13:00.282215+00:00
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