Delete row sig_cfafc6f0c2e6 from signals

id sig_cfafc6f0c2e6
event_id evt_2da39768de0f
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_656c270f0 ...
dedupe_key signal_enriched:discovery_ipo_delta:f8f3d2b41d3cf0 ...
throttle_s 0
created_at 2026-04-07T23:23:54.391414+00:00
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