Delete row sig_402062b8939a from signals

id sig_402062b8939a
event_id evt_f591ab87cfe9
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_9a2b4d519 ...
dedupe_key signal_enriched:discovery_ipo_delta:dff5d55d8f72d3 ...
throttle_s 0
created_at 2026-04-22T12:11:11.616908+00:00
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