Delete row sig_a006ab438faf from signals

id sig_a006ab438faf
event_id evt_c33a5b7d00ea
watcher_id NULL
signal_type delivery_failure
value {"delivery_fp":"ack:thr_0a6a7f6b2a5374 ...
threshold NULL
direction NULL
severity high
window NULL
source slack_outbox
reason_trace {}
dedupe_key delivery_failure:2026-04-08:ack:thr_0a6a7f6b2a5374 ...
throttle_s 0
created_at 2026-04-08T23:20:33.158201+00:00
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