Delete row sig_fb8bb6f67708 from signals

id sig_fb8bb6f67708
event_id evt_6d34e0988430
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_e7b7587fb ...
dedupe_key signal_enriched:news_delta:54dee64f0f8bba8f
throttle_s 0
created_at 2026-04-09T20:52:32.717865+00:00
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