Delete row sig_308e3b8ce856 from signals

id sig_308e3b8ce856
event_id evt_75ebb102d66d
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-16T10:15:40.769435+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:f4e86c696d195827
throttle_s 0
created_at 2026-04-16T10:15:40.769435+00:00
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