Delete row sig_157edf527baa from signals

id sig_157edf527baa
event_id evt_a27c40e7dbd6
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_4b23ccb9d ...
dedupe_key signal_enriched:news_delta:9ce4556664045aff
throttle_s 0
created_at 2026-04-18T01:40:16.503289+00:00
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