Delete row sig_52cef889facb from signals

id sig_52cef889facb
event_id evt_f78f4f1031ba
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-20T06:04:38.807337+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:66c757f55da7194d
throttle_s 0
created_at 2026-04-20T06:04:38.807337+00:00
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