Delete row sig_a1fb7961dc04 from signals

id sig_a1fb7961dc04
event_id evt_5e5335de0254
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_eb0ad0265 ...
dedupe_key signal_enriched:news_delta:3141c9de4261dd3c
throttle_s 0
created_at 2026-04-21T04:05:36.935278+00:00
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