Delete row sig_4b5f8999fce1 from signals

id sig_4b5f8999fce1
event_id evt_ccc6303d4a0b
watcher_id NULL
signal_type discovery_new_listings_snapshot
value {"as_of":"2026-04-12T17:46:47.321530+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_new_listings_snapshot:087dddad9d09cff4
throttle_s 0
created_at 2026-04-12T17:46:47.321530+00:00
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