Delete row sig_28a22ffcacc2 from signals

id sig_28a22ffcacc2
event_id evt_7129672db932
watcher_id NULL
signal_type discovery_crypto_extremes_snapshot
value {"as_of":"2026-04-15T17:34:08.881930+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_crypto_extremes_snapshot:c39802a4e7f19b9 ...
throttle_s 0
created_at 2026-04-15T17:34:08.881930+00:00
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