Delete row sig_c8a992f5229c from signals

id sig_c8a992f5229c
event_id evt_18a7d9c1a232
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_deed00bb5 ...
dedupe_key signal_enriched:news_delta:f95267f3f7b282ed
throttle_s 0
created_at 2026-04-21T03:02:40.520965+00:00
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