Delete row sig_99753ca1c6a7 from signals

id sig_99753ca1c6a7
event_id evt_7ecbb4737cfe
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_0eed65243 ...
dedupe_key signal_enriched:news_delta:97a516adbb87e1ac
throttle_s 0
created_at 2026-04-09T13:30:32.843272+00:00
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