Delete row sig_ff9ae5cc3f51 from signals

id sig_ff9ae5cc3f51
event_id evt_7257df5d3fd3
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_684d7d535 ...
dedupe_key signal_enriched:discovery_ipo_delta:f645c5d837df1a ...
throttle_s 0
created_at 2026-04-17T20:22:56.060872+00:00
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