Delete row sig_19939f6c1896 from signals

id sig_19939f6c1896
event_id evt_3f6597adbc81
watcher_id NULL
signal_type discovery_options_flow_snapshot
value {"as_of":"2026-04-07T03:18:43.307533+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_options_flow_snapshot:2c8661d15d04413b
throttle_s 0
created_at 2026-04-07T03:18:43.307533+00:00
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