Delete row sig_f8f8916dcda1 from signals

id sig_f8f8916dcda1
event_id evt_df716c589e8b
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T04:17:12.535039+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f0e77ed713225dcc
throttle_s 0
created_at 2026-04-19T04:17:12.535039+00:00
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