Delete row sig_8f4ed4562653 from signals

id sig_8f4ed4562653
event_id evt_c10ab005a379
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T13:54:55.201897+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:25f11d8b3f33927f
throttle_s 0
created_at 2026-04-19T13:54:55.201897+00:00
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