Delete row sig_cca5e4c5866c from signals

id sig_cca5e4c5866c
event_id evt_c41cea2c8daa
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:2026-04-19T10
throttle_s 0
created_at 2026-04-19T10:02:58.780981+00:00
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