Delete row sig_286c644ae346 from signals

id sig_286c644ae346
event_id evt_c496ca3bf798
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_e746536cf ...
dedupe_key signal_enriched:news_delta:f9c853b6867371e8
throttle_s 0
created_at 2026-04-17T15:36:58.588479+00:00
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