Delete row sig_f18bbc568eb9 from signals

id sig_f18bbc568eb9
event_id evt_6edf2e92cb47
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_a6c5ffa2b ...
dedupe_key signal_enriched:news_delta:bb1b4e7cd8657448
throttle_s 0
created_at 2026-04-09T05:26:04.062662+00:00
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