Delete row sig_39f65feccdce from signals

id sig_39f65feccdce
event_id evt_0a859ad0e430
watcher_id NULL
signal_type news_snapshot
value {"as_of":"2026-04-18T00:07:14.956152+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {}
dedupe_key news_snapshot:a4f03498623eaea8
throttle_s 0
created_at 2026-04-18T00:07:14.956152+00:00
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