Delete row sig_1520eba55f1c from signals

id sig_1520eba55f1c
event_id evt_642a4f6fc25d
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-19T11:16:24.658368+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:dd7f26dc188daa8a
throttle_s 0
created_at 2026-04-19T11:16:24.658368+00:00
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