Delete row sig_ff69106d8cac from signals

id sig_ff69106d8cac
event_id evt_85463a29cad7
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-13T10:55:50.189691+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:7510082187be4f7d
throttle_s 0
created_at 2026-04-13T10:55:50.189691+00:00
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