Delete row sig_fb6fc1e8f68e from signals

id sig_fb6fc1e8f68e
event_id evt_05a90d77a144
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_db603a345 ...
dedupe_key signal_enriched:news_delta:bcae29b50e01f9cb
throttle_s 0
created_at 2026-04-21T04:44:49.842035+00:00
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