Delete row sig_12db91990e56 from signals

id sig_12db91990e56
event_id evt_56c9884b5419
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T20:28:46.539629+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:0f391ecea27b332f
throttle_s 0
created_at 2026-04-08T20:28:46.539629+00:00
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