Delete row sig_9c68a734fea4 from signals

id sig_9c68a734fea4
event_id evt_4cebdde5c6ef
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T22:02:10.915055+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:6454dd8a26aa23c3
throttle_s 0
created_at 2026-04-11T22:02:10.915055+00:00
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