Delete row sig_a5ee68858947 from signals

id sig_a5ee68858947
event_id evt_140794f81f7b
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_09553a7f3 ...
dedupe_key signal_enriched:news_delta:4d65e52bee52d33f
throttle_s 0
created_at 2026-04-18T04:44:01.597648+00:00
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