Delete row sig_00d11dd2ec66 from signals

id sig_00d11dd2ec66
event_id evt_1b9a810417a0
watcher_id NULL
signal_type system_distress
value {"alerts":[{"count":70,"level& ...
threshold NULL
direction NULL
severity medium
window NULL
source observability
reason_trace {}
dedupe_key observability_alert:2026-04-06T23
throttle_s 0
created_at 2026-04-06T23:03:07.402852+00:00
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