Delete row sig_f59d2a52ed1c from signals

id sig_f59d2a52ed1c
event_id evt_44033364884e
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_53b72307e ...
dedupe_key signal_enriched:discovery_ipo_delta:421b214b815819 ...
throttle_s 0
created_at 2026-04-18T17:18:47.705432+00:00
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