Delete row sig_da6da004a0c0 from signals

id sig_da6da004a0c0
event_id evt_6d2c05ce7ffc
watcher_id NULL
signal_type system_distress
value {"alerts":[{"lag":670,"level&# ...
threshold NULL
direction NULL
severity medium
window NULL
source observability
reason_trace {}
dedupe_key observability_alert:2026-04-08T19
throttle_s 0
created_at 2026-04-08T19:59:39.094367+00:00
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