Delete row sig_492172fa21cb from signals

id sig_492172fa21cb
event_id evt_a738618bf2cb
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_d7d2315d8 ...
dedupe_key signal_enriched:discovery_ipo_delta:e36d6a8464e23a ...
throttle_s 0
created_at 2026-04-07T23:23:54.391414+00:00
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