Delete row sig_330293c45477 from signals

id sig_330293c45477
event_id evt_eea5572a2d32
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_4eac44fec ...
dedupe_key signal_enriched:news_delta:4ee98368b7b91e89
throttle_s 0
created_at 2026-04-16T13:45:43.692416+00:00
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