Delete row sig_b92b700bdffe from signals

id sig_b92b700bdffe
event_id evt_46c9210d4b30
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_0fe4d440e ...
dedupe_key signal_enriched:discovery_ipo_delta:31e7bdb2b5cd7c ...
throttle_s 0
created_at 2026-04-17T21:52:12.771882+00:00
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