Delete row sig_ff77f8c1e5e8 from signals

id sig_ff77f8c1e5e8
event_id evt_bb779367bdca
watcher_id NULL
signal_type discovery_new_listings_snapshot
value {"as_of":"2026-04-20T09:07:46.071580+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_new_listings_snapshot:4bd5f221080b9e86
throttle_s 0
created_at 2026-04-20T09:07:46.071580+00:00
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