Delete row sig_4772fa2fd7f6 from signals

id sig_4772fa2fd7f6
event_id evt_9a0894893114
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_03ce7e4a6 ...
dedupe_key signal_enriched:news_delta:56e7ab9f1e8ae2ad
throttle_s 0
created_at 2026-04-13T17:31:17.065466+00:00
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