Delete row sig_518b09863d2b from signals

id sig_518b09863d2b
event_id evt_72fc48a1937d
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_16cb2c41c ...
dedupe_key signal_enriched:news_delta:79933f54b9b0f7ea
throttle_s 0
created_at 2026-04-07T23:54:56.056883+00:00
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