Delete row sig_48e4022d5519 from signals

id sig_48e4022d5519
event_id evt_8c687b6ef8ec
watcher_id NULL
signal_type discovery_ipo_snapshot
value {"as_of":"2026-04-08T07:31:44.637083+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_ipo_snapshot:4709b506c0851be3
throttle_s 0
created_at 2026-04-08T07:31:44.637083+00:00
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