Delete row sig_cff968c663c8 from signals

id sig_cff968c663c8
event_id evt_2683388e6052
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T22:21:38.683646+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:cf237f21f5f071dd
throttle_s 0
created_at 2026-04-09T22:21:38.683646+00:00
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