Delete row sig_a499e1f377ef from signals

id sig_a499e1f377ef
event_id evt_a39e9f6e0c8b
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_1ecc4ceae ...
dedupe_key signal_enriched:news_delta:816e11170bb130ed
throttle_s 0
created_at 2026-04-09T00:07:15.576657+00:00
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