Delete row sig_f4dde9e90910 from signals

id sig_f4dde9e90910
event_id evt_024ecf478ccf
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_417ca8836 ...
dedupe_key signal_enriched:discovery_ipo_delta:56639bda669889 ...
throttle_s 0
created_at 2026-04-04T07:06:10.830609+00:00
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