Delete row sig_c0c79420e608 from signals

id sig_c0c79420e608
event_id evt_ee3b009319e8
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_8b10e7cf0 ...
dedupe_key signal_enriched:news_delta:f4641db0742699e1
throttle_s 0
created_at 2026-04-20T21:37:11.351782+00:00
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