Delete row sig_7f299e57616e from signals

id sig_7f299e57616e
event_id evt_8e414bab3774
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_6b6814429 ...
dedupe_key signal_enriched:news_delta:42d2d5f1abbf1e8a
throttle_s 0
created_at 2026-04-20T09:28:58.732998+00:00
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