Delete row sig_f6419540e1cc from signals

id sig_f6419540e1cc
event_id evt_efb1fc29d56b
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_7189c05a7 ...
dedupe_key signal_enriched:news_delta:3f958401c33b120d
throttle_s 0
created_at 2026-04-06T19:27:28.035835+00:00
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