Delete row sig_f18420bbc1f4 from signals

id sig_f18420bbc1f4
event_id evt_aa93c67f1137
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_efc1254ff ...
dedupe_key signal_enriched:news_delta:c32dfccf9803061a
throttle_s 0
created_at 2026-04-07T23:39:52.314972+00:00
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