Delete row sig_f75822b54199 from signals

id sig_f75822b54199
event_id evt_0c03b1419d2f
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_8de1258fe ...
dedupe_key signal_enriched:news_delta:efed3e79b60a357c
throttle_s 0
created_at 2026-04-08T03:15:55.959245+00:00
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