Delete row sig_a2643d61afa7 from signals

id sig_a2643d61afa7
event_id evt_fab7275689ec
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_8a677fd08 ...
dedupe_key signal_enriched:news_delta:cbd8dadd6684c5e9
throttle_s 0
created_at 2026-04-16T22:05:26.107663+00:00
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