Delete row sig_0f46d24a8d1c from signals

id sig_0f46d24a8d1c
event_id evt_47839589220b
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T00:17:48.652854+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:770c4cbec8c90308
throttle_s 0
created_at 2026-04-08T00:17:48.652854+00:00
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