Delete row sig_18c27306c4be from signals

id sig_18c27306c4be
event_id evt_77a6e306271f
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_b50f9889b ...
dedupe_key signal_enriched:news_delta:eca078803a2f2887
throttle_s 0
created_at 2026-04-12T03:16:46.896213+00:00
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