Delete row sig_0172dc99f4d9 from signals

id sig_0172dc99f4d9
event_id evt_777d7dc54c67
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T09:32:54.889598+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:eb496179c0d178a2
throttle_s 0
created_at 2026-04-08T09:32:54.889598+00:00
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