Delete row sig_f6c0fa9c736f from signals

id sig_f6c0fa9c736f
event_id evt_0c3c643a3f5a
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_f799cb40b ...
dedupe_key signal_enriched:news_delta:235c5aee49986b9f
throttle_s 0
created_at 2026-04-12T07:50:13.733402+00:00
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