Delete row sig_2a999afe985b from signals

id sig_2a999afe985b
event_id evt_89d8fc595d10
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_00219afb6 ...
dedupe_key signal_enriched:news_delta:9fee1be754f0ad20
throttle_s 0
created_at 2026-04-16T12:11:45.777260+00:00
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