Delete row sig_c1f1aefb952e from signals

id sig_c1f1aefb952e
event_id evt_74942f91b8eb
watcher_id NULL
signal_type news_snapshot
value {"as_of":"2026-04-16T21:26:02.559030+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {}
dedupe_key news_snapshot:5be2b2e7447bd41a
throttle_s 0
created_at 2026-04-16T21:26:02.559030+00:00
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