Delete row sig_c09308199e2d from signals

id sig_c09308199e2d
event_id evt_5dbb4b4e7bf8
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_02c770ead ...
dedupe_key signal_enriched:news_delta:8c85efca56b02d20
throttle_s 0
created_at 2026-04-20T03:35:20.792504+00:00
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