Delete row sig_31924b94267f from signals

id sig_31924b94267f
event_id evt_ca193261079a
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-12T05:42:08.707861+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:f2cf36764c8bc0b3
throttle_s 0
created_at 2026-04-12T05:42:08.707861+00:00
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