Delete row sig_83a267cfb1d5 from signals

id sig_83a267cfb1d5
event_id evt_88920969ee9b
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_0b821f71f ...
dedupe_key signal_enriched:discovery_ipo_delta:7c5328942d7f54 ...
throttle_s 0
created_at 2026-04-09T12:08:05.625638+00:00
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