Delete row sig_c501a3f11f30 from signals

id sig_c501a3f11f30
event_id evt_d214325d9997
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_2fbcf2156 ...
dedupe_key signal_enriched:news_delta:13dae878c7e87018
throttle_s 0
created_at 2026-04-20T13:02:54.773576+00:00
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