Delete row sig_6cf199b48820 from signals

id sig_6cf199b48820
event_id evt_93f784371781
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-13T05:35:08.132041+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f7dbdf1f0bc3215e
throttle_s 0
created_at 2026-04-13T05:35:08.132041+00:00
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