Delete row sig_990548c89957 from signals

id sig_990548c89957
event_id evt_99fd35f22f5e
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_945d35c2e ...
dedupe_key signal_enriched:news_delta:4391aacff3431898
throttle_s 0
created_at 2026-04-22T14:40:52.251786+00:00
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