Delete row sig_9e53ff1a5c28 from signals

id sig_9e53ff1a5c28
event_id evt_38262100fd0e
watcher_id NULL
signal_type discovery_options_flow_snapshot
value {"as_of":"2026-04-17T18:02:19.233758+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_options_flow_snapshot:659b4e6414561843
throttle_s 0
created_at 2026-04-17T18:02:19.233758+00:00
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