Delete row sig_f93af90393db from signals

id sig_f93af90393db
event_id evt_f826e1fb8b71
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_75290c7c2 ...
dedupe_key signal_enriched:news_delta:3891e9ea98f7886b
throttle_s 0
created_at 2026-04-08T21:48:34.629124+00:00
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