Delete row sig_0fa31a826b32 from signals

id sig_0fa31a826b32
event_id evt_0374fcf1ac88
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_d6aef0a95 ...
dedupe_key signal_enriched:news_delta:83a72f6aaa2cd093
throttle_s 0
created_at 2026-04-10T19:36:11.967727+00:00
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