Delete row sig_3cfc5c18f177 from signals

id sig_3cfc5c18f177
event_id evt_00bee9860f15
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_162f1a8d6 ...
dedupe_key signal_enriched:news_delta:897f22b7eb247b6c
throttle_s 0
created_at 2026-04-21T13:43:50.605762+00:00
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