Delete row sig_cff3f68657b1 from signals

id sig_cff3f68657b1
event_id evt_f58567018000
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_41d3bf7d1 ...
dedupe_key signal_enriched:discovery_ipo_delta:f232d8db6bf6f1 ...
throttle_s 0
created_at 2026-04-11T09:08:15.689426+00:00
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