Delete row sig_217ef5443619 from signals

id sig_217ef5443619
event_id evt_bd475a325f32
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_3a909df25 ...
dedupe_key signal_enriched:news_delta:8f2f5898fbc3cc34
throttle_s 0
created_at 2026-04-18T22:33:12.105852+00:00
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