Delete row sig_2b1f43539404 from signals

id sig_2b1f43539404
event_id evt_0f1b8c877083
watcher_id NULL
signal_type discovery_new_listings_snapshot
value {"as_of":"2026-04-10T17:21:18.771125+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_new_listings_snapshot:da9bf6655d69eb9e
throttle_s 0
created_at 2026-04-10T17:21:18.771125+00:00
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