Delete row sig_b90020856e64 from signals

id sig_b90020856e64
event_id evt_255382366ccd
watcher_id NULL
signal_type discovery_ipo_snapshot
value {"as_of":"2026-04-11T15:08:00.056576+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_ipo_snapshot:d145c73988c5d715
throttle_s 0
created_at 2026-04-11T15:08:00.056576+00:00
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