Delete row sig_8938a4ffb135 from signals

id sig_8938a4ffb135
event_id evt_2179c8648960
watcher_id NULL
signal_type discovery_crypto_extremes_snapshot
value {"as_of":"2026-04-11T12:09:00.614473+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_crypto_extremes_snapshot:f348a10b0722ff7 ...
throttle_s 0
created_at 2026-04-11T12:09:00.614473+00:00
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