Delete row sig_759240d4de5a from signals

id sig_759240d4de5a
event_id evt_8d9e7f13e16a
watcher_id NULL
signal_type discovery_crypto_extremes_snapshot
value {"as_of":"2026-04-21T13:49:56.264514+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_crypto_extremes_snapshot:02cee4c320277be ...
throttle_s 0
created_at 2026-04-21T13:49:56.264514+00:00
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