Delete row sig_f68659d84610 from signals

id sig_f68659d84610
event_id evt_13c40db95706
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_7c9247341 ...
dedupe_key signal_enriched:discovery_ipo_delta:c6b90c046aa34d ...
throttle_s 0
created_at 2026-04-20T14:11:25.277652+00:00
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