Delete row sig_309304f2195d from signals

id sig_309304f2195d
event_id evt_50c3f6a47067
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_c42e906dd ...
dedupe_key signal_enriched:news_delta:25d9efe28910dd95
throttle_s 0
created_at 2026-04-17T12:37:32.586911+00:00
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