Delete row sig_f197d4fc358f from signals

id sig_f197d4fc358f
event_id evt_1a420f0e8b22
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_7d41e16ee ...
dedupe_key signal_enriched:news_delta:6b8e7f0f3ca425af
throttle_s 0
created_at 2026-04-16T04:52:33.393701+00:00
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