Delete row sig_f14e6faf9e6e from signals

id sig_f14e6faf9e6e
event_id evt_d0cefc5798af
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T10:15:18.402509+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:08180d8ecb28ff7d
throttle_s 0
created_at 2026-04-08T10:15:18.402509+00:00
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