Delete row sig_82f0b883d379 from signals

id sig_82f0b883d379
event_id evt_93ce525923de
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_76a0393e9 ...
dedupe_key signal_enriched:discovery_ipo_delta:6dc26f9f684a03 ...
throttle_s 0
created_at 2026-04-21T13:49:56.265209+00:00
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