Delete row sig_ff9c67ed82c3 from signals

id sig_ff9c67ed82c3
event_id evt_320708dc7b14
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T01:55:34.923228+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:c9008b962d904597
throttle_s 0
created_at 2026-04-10T01:55:34.923228+00:00
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