Delete row sig_7438bb381304 from signals

id sig_7438bb381304
event_id evt_2d3f3690bfd5
watcher_id NULL
signal_type discovery_crypto_extremes_snapshot
value {"as_of":"2026-04-10T13:12:08.706299+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_crypto_extremes_snapshot:f54a9028f022d3b ...
throttle_s 0
created_at 2026-04-10T13:12:08.706299+00:00
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