Delete row sig_a6a9dccbda15 from signals

id sig_a6a9dccbda15
event_id evt_01c2455c0895
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_2117be9bf ...
dedupe_key signal_enriched:news_delta:7df166110628cd7a
throttle_s 0
created_at 2026-04-04T10:16:54.236444+00:00
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