Delete row sig_8c7c2d7da2f8 from signals

id sig_8c7c2d7da2f8
event_id evt_fb6d743f71f9
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_78c413de9 ...
dedupe_key signal_enriched:discovery_ipo_delta:b6b5f62d987301 ...
throttle_s 0
created_at 2026-04-13T10:26:04.867531+00:00
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