Delete row sig_255e11699c88 from signals

id sig_255e11699c88
event_id evt_145e4cf0d873
watcher_id NULL
signal_type discovery_crypto_extremes_snapshot
value {"as_of":"2026-04-07T23:23:54.390811+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_crypto_extremes_snapshot:ba8e79025f90c73 ...
throttle_s 0
created_at 2026-04-07T23:23:54.390811+00:00
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