Delete row sig_f6f36f057429 from signals

id sig_f6f36f057429
event_id evt_133929a52ee5
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_6d0b7a7b5 ...
dedupe_key signal_enriched:news_delta:829d21cdb781d22b
throttle_s 0
created_at 2026-04-16T23:58:22.798003+00:00
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