Delete row sig_14b534b2822b from signals

id sig_14b534b2822b
event_id evt_fde221af87ac
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T13:12:03.911498+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:3ce34e2c10d6f5df
throttle_s 0
created_at 2026-04-10T13:12:03.911498+00:00
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