Delete row sig_09143553fd8d from signals

id sig_09143553fd8d
event_id evt_f227ee7c845b
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-21T13:29:26.848022+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:2846a794d5fa000b
throttle_s 0
created_at 2026-04-21T13:29:26.848022+00:00
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