Delete row sig_444186384008 from signals

id sig_444186384008
event_id evt_00a2267d4830
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_6799cf626 ...
dedupe_key signal_enriched:discovery_ipo_delta:b410e1ae7b60ab ...
throttle_s 0
created_at 2026-04-09T19:34:12.195303+00:00
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