Delete row sig_9be205500599 from signals

id sig_9be205500599
event_id evt_163844abdd27
watcher_id NULL
signal_type discovery_options_flow_snapshot
value {"as_of":"2026-04-14T23:19:43.594040+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_options_flow_snapshot:82c8bf2291616e3a
throttle_s 0
created_at 2026-04-14T23:19:43.594040+00:00
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