Delete row sig_28881b674694 from signals

id sig_28881b674694
event_id evt_1b5564ac6d38
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-21T00:08:29.825958+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:82ea37e7160e47c1
throttle_s 0
created_at 2026-04-21T00:08:29.825958+00:00
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