Delete row sig_fc476a72cf48 from signals

id sig_fc476a72cf48
event_id evt_53e1d40310dd
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_a992e2655 ...
dedupe_key signal_enriched:news_delta:dd3421ddb423c976
throttle_s 0
created_at 2026-04-19T18:38:57.045494+00:00
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