Delete row sig_aac515908447 from signals

id sig_aac515908447
event_id evt_2bd55cb72396
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_bf01e243d ...
dedupe_key signal_enriched:discovery_ipo_delta:023364eeb6cc86 ...
throttle_s 0
created_at 2026-04-17T18:02:19.234747+00:00
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