Delete row sig_53b2727c780b from signals

id sig_53b2727c780b
event_id evt_0119b9a569b2
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-19T02:17:29.219563+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:25aa713979884582
throttle_s 0
created_at 2026-04-19T02:17:29.219563+00:00
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