Delete row sig_6f37578352c2 from signals

id sig_6f37578352c2
event_id evt_8fca5f4796b6
watcher_id NULL
signal_type discovery_ipo_snapshot
value {"as_of":"2026-04-21T10:45:03.230503+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_ipo_snapshot:1cd305450a5859cd
throttle_s 0
created_at 2026-04-21T10:45:03.230503+00:00
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