Delete row sig_601f816fd266 from signals

id sig_601f816fd266
event_id evt_41c08d6ae3c2
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_c58d0356e ...
dedupe_key signal_enriched:news_delta:715774cc59ec8f96
throttle_s 0
created_at 2026-04-18T11:33:38.968220+00:00
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