Delete row sig_b68971b071f1 from signals

id sig_b68971b071f1
event_id evt_fcb91ada2105
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_4030eb578 ...
dedupe_key signal_enriched:discovery_ipo_delta:20d6a1d865e54f ...
throttle_s 0
created_at 2026-04-22T13:12:40.941923+00:00
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