Delete row sig_d50239ed204d from signals

id sig_d50239ed204d
event_id evt_b608a072c96d
watcher_id NULL
signal_type discovery_ipo_snapshot
value {"as_of":"2026-04-20T10:08:18.321277+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_ipo_snapshot:75cdd8be50d0b576
throttle_s 0
created_at 2026-04-20T10:08:18.321277+00:00
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