Delete row sig_8b1c3e719100 from signals

id sig_8b1c3e719100
event_id evt_a6e486838758
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_6fa136a7b ...
dedupe_key signal_enriched:discovery_ipo_delta:7627cfc943bb23 ...
throttle_s 0
created_at 2026-04-09T04:42:09.468703+00:00
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