Delete row sig_f226556e28c9 from signals

id sig_f226556e28c9
event_id evt_4c5848ae11a7
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_95a27e5bb ...
dedupe_key signal_enriched:news_delta:554b46d6fec4ff6d
throttle_s 0
created_at 2026-04-09T06:04:20.770582+00:00
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