Delete row sig_cb21f32a72ef from signals

id sig_cb21f32a72ef
event_id evt_bcc9b8bbefb6
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_1207b05ab ...
dedupe_key signal_enriched:discovery_ipo_delta:b5197c6ce0a126 ...
throttle_s 0
created_at 2026-04-08T10:33:26.208520+00:00
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