Delete row sig_f3ebfe045347 from signals

id sig_f3ebfe045347
event_id evt_2b413251e9a3
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_5838a8817 ...
dedupe_key signal_enriched:news_delta:dcd0bb2c90147269
throttle_s 0
created_at 2026-04-12T07:50:13.720651+00:00
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