Delete row sig_fa52bbb053c7 from signals

id sig_fa52bbb053c7
event_id evt_e29c698cd659
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_0e2ca8cd3 ...
dedupe_key signal_enriched:news_delta:ee0d9fadfacd3cc7
throttle_s 0
created_at 2026-04-19T01:31:58.650237+00:00
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