Delete row sig_5dfa91b74227 from signals

id sig_5dfa91b74227
event_id evt_74d8d686d17a
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_c80250ed0 ...
dedupe_key signal_enriched:news_delta:899da8774567a273
throttle_s 0
created_at 2026-04-10T03:30:54.403947+00:00
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