Delete row sig_f75bd399bfd4 from signals

id sig_f75bd399bfd4
event_id evt_9d5ef80dc356
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T02:59:51.532128+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:71f644ff4b80ba3c
throttle_s 0
created_at 2026-04-20T02:59:51.532128+00:00
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