Delete row sig_c901c968ce3d from signals

id sig_c901c968ce3d
event_id evt_318817cb86e4
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_93697bfeb ...
dedupe_key signal_enriched:news_delta:9e5f987fda4d3ef3
throttle_s 0
created_at 2026-04-09T20:52:32.742712+00:00
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