Delete row sig_446bf4b03237 from signals

id sig_446bf4b03237
event_id evt_6faf04399ca4
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_3111ef47e ...
dedupe_key signal_enriched:news_delta:d3a916c95f737312
throttle_s 0
created_at 2026-04-10T13:38:20.364081+00:00
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