Delete row sig_a3a5bb337bdc from signals

id sig_a3a5bb337bdc
event_id evt_63a5abfcc466
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_e5f47a45c ...
dedupe_key signal_enriched:news_delta:9e7824e9901b35fe
throttle_s 0
created_at 2026-04-19T20:59:44.497169+00:00
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