Delete row sig_512e4b2e7472 from signals

id sig_512e4b2e7472
event_id evt_7de0a1e8cb5a
watcher_id NULL
signal_type discovery_new_listings_snapshot
value {"as_of":"2026-04-13T05:56:02.153937+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_new_listings_snapshot:4aa1c0c2cff51ca1
throttle_s 0
created_at 2026-04-13T05:56:02.153937+00:00
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