Delete row sig_c21ab758c8bf from signals

id sig_c21ab758c8bf
event_id evt_e20321183c36
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_3d3b1f666 ...
dedupe_key signal_enriched:news_delta:9bf9369302cbcc38
throttle_s 0
created_at 2026-04-18T07:45:38.568833+00:00
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