Delete row sig_446c3b7a62dc from signals

id sig_446c3b7a62dc
event_id evt_6170e4e8a074
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_7d9863c8d ...
dedupe_key signal_enriched:news_delta:15852a2882484715
throttle_s 0
created_at 2026-04-16T21:26:03.694938+00:00
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