Delete row sig_1875f7799324 from signals

id sig_1875f7799324
event_id evt_715afbc20270
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-09T03:12:49.785665+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:baf479f975c93dec
throttle_s 0
created_at 2026-04-09T03:12:49.785665+00:00
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