Delete row sig_2a889fc41be1 from signals

id sig_2a889fc41be1
event_id evt_627cf95862fb
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_509948ae3 ...
dedupe_key signal_enriched:news_delta:c24730fb521be984
throttle_s 0
created_at 2026-04-19T03:01:53.977257+00:00
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