Delete row sig_2b4a191822dd from signals

id sig_2b4a191822dd
event_id evt_bb175e918bcc
watcher_id NULL
signal_type discovery_new_listings_snapshot
value {"as_of":"2026-04-20T01:00:47.908512+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_new_listings_snapshot:4648787a009e1b3e
throttle_s 0
created_at 2026-04-20T01:00:47.908512+00:00
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