Delete row sig_8c2d1053ec5f from signals

id sig_8c2d1053ec5f
event_id evt_46cde738083c
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_c61501f49 ...
dedupe_key signal_enriched:news_delta:326f7bc90a34d647
throttle_s 0
created_at 2026-04-07T02:56:07.875548+00:00
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