Delete row sig_a8a7bd3068a4 from signals

id sig_a8a7bd3068a4
event_id evt_876dcc2c0f12
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-07T09:52:50.631351+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:9cc421ce49942ec3
throttle_s 0
created_at 2026-04-07T09:52:50.631351+00:00
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