Delete row sig_047422604590 from signals

id sig_047422604590
event_id evt_4cabbf7fb4d3
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_7975305cb ...
dedupe_key signal_enriched:discovery_ipo_delta:02805cf879c251 ...
throttle_s 0
created_at 2026-04-22T14:13:37.135360+00:00
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