Delete row sig_6fac3ddffefc from signals

id sig_6fac3ddffefc
event_id evt_00901fb99c15
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T08:30:24.756503+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:80735794c8f8e86b
throttle_s 0
created_at 2026-04-22T08:30:24.756503+00:00
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