Delete row sig_278294effa2e from signals

id sig_278294effa2e
event_id evt_16ebf324f65e
watcher_id NULL
signal_type system_distress
value {"alerts":[{"count":2,"level&# ...
threshold NULL
direction NULL
severity medium
window NULL
source observability
reason_trace {}
dedupe_key observability_alert:2026-04-09T00
throttle_s 0
created_at 2026-04-09T00:00:00.267231+00:00
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