Delete row sig_40302d18e625 from signals

id sig_40302d18e625
event_id evt_1276f06df4b5
watcher_id NULL
signal_type discovery_crypto_extremes_snapshot
value {"as_of":"2026-04-18T00:01:35.733738+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_crypto_extremes_snapshot:19ea9ca84c5668d ...
throttle_s 0
created_at 2026-04-18T00:01:35.733738+00:00
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