Delete row sig_2c3590121788 from signals

id sig_2c3590121788
event_id evt_6c2f917751ed
watcher_id NULL
signal_type discovery_ipo_snapshot
value {"as_of":"2026-04-09T13:37:34.639481+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_ipo_snapshot:340ae0e6b462f709
throttle_s 0
created_at 2026-04-09T13:37:34.639481+00:00
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