Delete row sig_dcbf96063882 from signals

id sig_dcbf96063882
event_id evt_5b8b303813b8
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_b90561fd9 ...
dedupe_key signal_enriched:news_delta:2118c2c9da658e7e
throttle_s 0
created_at 2026-04-18T16:34:30.499601+00:00
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