Delete row sig_826c9fe21b7a from signals

id sig_826c9fe21b7a
event_id evt_b8935be2a117
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_696b3d105 ...
dedupe_key signal_enriched:news_delta:b298194b1ae5be56
throttle_s 0
created_at 2026-04-17T21:07:05.741583+00:00
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