Delete row sig_671b9192a28a from signals

id sig_671b9192a28a
event_id evt_735da2b36d37
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T02:17:46.796684+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:08a0371b5becb323
throttle_s 0
created_at 2026-04-10T02:17:46.796684+00:00
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