Delete row sig_8f5f66769d4f from signals

id sig_8f5f66769d4f
event_id evt_45c873bd2299
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T05:10:52.176057+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:1efbf7b868ab5ee5
throttle_s 0
created_at 2026-04-11T05:10:52.176057+00:00
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