Delete row sig_dfd77abd4d77 from signals

id sig_dfd77abd4d77
event_id evt_5ce8fae58fc5
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-13T07:26:15.765186+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:087dc826a3c166cf
throttle_s 0
created_at 2026-04-13T07:26:15.765186+00:00
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