Delete row sig_6f69e174d266 from signals

id sig_6f69e174d266
event_id evt_105e87127bc0
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_21cd81157 ...
dedupe_key signal_enriched:discovery_ipo_delta:a6e668f3e8d334 ...
throttle_s 0
created_at 2026-04-08T07:31:44.637479+00:00
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