Delete row sig_6e7e1f8ed246 from signals

id sig_6e7e1f8ed246
event_id evt_d2877309f33b
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_bcf008416 ...
dedupe_key signal_enriched:news_delta:fc4e6a9a6249ca36
throttle_s 0
created_at 2026-04-21T11:29:33.879533+00:00
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