Delete row sig_8019801f95f4 from signals

id sig_8019801f95f4
event_id evt_c27fb7f3943f
watcher_id NULL
signal_type discovery_ipo_snapshot
value {"as_of":"2026-04-08T02:28:02.401309+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_ipo_snapshot:36a2c9d5ff17efa9
throttle_s 0
created_at 2026-04-08T02:28:02.401309+00:00
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