Delete row sig_383902057c7c from signals

id sig_383902057c7c
event_id evt_ef294742a5de
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_e9c9aaa90 ...
dedupe_key signal_enriched:news_delta:5a15d055683055ed
throttle_s 0
created_at 2026-04-22T13:33:25.606168+00:00
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