Delete row sig_1f4ed68e5914 from signals

id sig_1f4ed68e5914
event_id evt_27f7654763fd
watcher_id NULL
signal_type job_dead_letter
value {"attempts":42,"job_id":"job_o ...
threshold NULL
direction NULL
severity high
window NULL
source scheduler
reason_trace {}
dedupe_key dead_letter:job_observability_tick_731d307f439f:20 ...
throttle_s 0
created_at 2026-04-12T00:00:05.933576+00:00
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