Delete row sig_00c8f4ca6340 from signals

id sig_00c8f4ca6340
event_id evt_927a37d3978f
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_3a2730386 ...
dedupe_key signal_enriched:news_delta:0b966b331d1d5d4f
throttle_s 0
created_at 2026-04-09T16:31:19.668823+00:00
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