Delete row sig_90921297f03e from signals

id sig_90921297f03e
event_id evt_920ca417f82e
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-18T05:06:11.297600+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:e7e95f42aa00eeda
throttle_s 0
created_at 2026-04-18T05:06:11.297600+00:00
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