Delete row sig_fea4bd05858f from signals

id sig_fea4bd05858f
event_id evt_7f016a4f6e45
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_7bed0d175 ...
dedupe_key signal_enriched:news_delta:db953474827bee59
throttle_s 0
created_at 2026-04-17T21:46:23.571940+00:00
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