Delete row sig_2dfcfa9da613 from signals

id sig_2dfcfa9da613
event_id evt_36913a8c4e81
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_8dfc36071 ...
dedupe_key signal_enriched:news_delta:f0e8f586e8ae47d8
throttle_s 0
created_at 2026-04-22T11:16:45.434672+00:00
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