Delete row sig_f0414840b88f from signals

id sig_f0414840b88f
event_id evt_df1156b9fd31
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_1744fc062 ...
dedupe_key signal_enriched:news_delta:3f105430c8effb6e
throttle_s 0
created_at 2026-04-11T04:34:20.207481+00:00
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