Delete row sig_ba4798315610 from signals

id sig_ba4798315610
event_id evt_3ef0c1ce5655
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_22c164319 ...
dedupe_key signal_enriched:news_delta:dfc07e718550715f
throttle_s 0
created_at 2026-04-19T12:01:22.859207+00:00
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