Delete row sig_3fdf6a6ffc1c from signals

id sig_3fdf6a6ffc1c
event_id evt_d1e0db257253
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_bab75d24f ...
dedupe_key signal_enriched:news_delta:fa2c1ffc3eb4bf4e
throttle_s 0
created_at 2026-04-09T22:16:08.966573+00:00
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