Delete row sig_819ecf38efb6 from signals

id sig_819ecf38efb6
event_id evt_f61e8a6163e0
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_c5269186d ...
dedupe_key signal_enriched:news_delta:9b755938f4bcc8e4
throttle_s 0
created_at 2026-04-16T05:37:58.652118+00:00
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