Delete row sig_a7ba7ce83112 from signals

id sig_a7ba7ce83112
event_id evt_dca764aa5fd9
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_3f62e8445 ...
dedupe_key signal_enriched:news_delta:e3ae9056a19ff926
throttle_s 0
created_at 2026-04-19T04:31:32.868520+00:00
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