Delete row sig_ff9509b7d0ae from signals

id sig_ff9509b7d0ae
event_id evt_73ac56c9ed4c
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T20:00:18.622268+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:a89fabc2c28676d3
throttle_s 0
created_at 2026-04-10T20:00:18.622268+00:00
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