Delete row sig_252c11a7e5a2 from signals

id sig_252c11a7e5a2
event_id evt_72b5246cd1ae
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-20T02:01:19.515093+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:c25bee1beeb422be
throttle_s 0
created_at 2026-04-20T02:01:19.515093+00:00
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