Delete row sig_1cdf1f3d5554 from signals

id sig_1cdf1f3d5554
event_id evt_60e5adfc2d9d
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_ba4011eaa ...
dedupe_key signal_enriched:news_delta:cd9e8abe94b6f3cf
throttle_s 0
created_at 2026-04-10T15:28:44.167726+00:00
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