Delete row sig_ece9d7542a5d from signals

id sig_ece9d7542a5d
event_id evt_6088a6bc8f4d
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-19T21:44:00.160791+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:38c3a001fb28baa7
throttle_s 0
created_at 2026-04-19T21:44:00.160791+00:00
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