Delete row sig_fffbf95a66e4 from signals

id sig_fffbf95a66e4
event_id evt_d3cc79723b01
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_a5494d107 ...
dedupe_key signal_enriched:discovery_ipo_delta:9bc03f4385747b ...
throttle_s 0
created_at 2026-04-08T22:43:46.053448+00:00
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