Delete row sig_4b86206a3259 from signals

id sig_4b86206a3259
event_id evt_f5845c01cd86
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_e28803fae ...
dedupe_key signal_enriched:discovery_ipo_delta:03b03832816ab3 ...
throttle_s 0
created_at 2026-04-08T21:48:34.772061+00:00
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