Delete row sig_f5aa44c52fc6 from signals

id sig_f5aa44c52fc6
event_id evt_4e6853a08337
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_78e0e7693 ...
dedupe_key signal_enriched:news_delta:2a47ff696221f76a
throttle_s 0
created_at 2026-04-09T16:31:19.681453+00:00
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