Delete row sig_6359690386f9 from signals

id sig_6359690386f9
event_id evt_2eec7627d576
watcher_id NULL
signal_type discovery_ipo_snapshot
value {"as_of":"2026-04-20T06:04:38.807337+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_ipo_snapshot:e14f7a9ed5293f66
throttle_s 0
created_at 2026-04-20T06:04:38.807337+00:00
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