Delete row sig_d60faefd9849 from signals

id sig_d60faefd9849
event_id evt_8b1c4724c640
watcher_id NULL
signal_type discovery_crypto_extremes_snapshot
value {"as_of":"2026-04-18T15:49:14.473685+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_crypto_extremes_snapshot:4515489b29b81e9 ...
throttle_s 0
created_at 2026-04-18T15:49:14.473685+00:00
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