Delete row sig_d4c587286dce from signals

id sig_d4c587286dce
event_id evt_fa73dc3989b7
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-12T11:45:34.865035+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:6f775faa374a0073
throttle_s 0
created_at 2026-04-12T11:45:34.865035+00:00
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