Delete row sig_ff25f8769fb8 from signals

id sig_ff25f8769fb8
event_id evt_7c4e6043b695
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-13T16:04:15.251204+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:4a1edf0e0423cf51
throttle_s 0
created_at 2026-04-13T16:04:15.251204+00:00
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