Delete row sig_8994f2f3c7d1 from signals

id sig_8994f2f3c7d1
event_id evt_f27500019b5c
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_9e2bd910a ...
dedupe_key signal_enriched:discovery_ipo_delta:9cb3b0e97a92e8 ...
throttle_s 0
created_at 2026-04-17T20:22:56.060872+00:00
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