Delete row sig_7c0ec516a6d6 from signals

id sig_7c0ec516a6d6
event_id evt_fb4c8e3a9cfa
watcher_id NULL
signal_type system_distress
value {"alerts":[{"level":"critical& ...
threshold NULL
direction NULL
severity high
window NULL
source observability
reason_trace {}
dedupe_key observability_alert:2026-04-20T21
throttle_s 0
created_at 2026-04-20T21:01:44.906270+00:00
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