Delete row sig_494c3124a37c from signals

id sig_494c3124a37c
event_id evt_59c6d19eca0b
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_5aa9ac835 ...
dedupe_key signal_enriched:news_delta:8943afa907a9480b
throttle_s 0
created_at 2026-04-14T22:34:45.006054+00:00
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