Delete row sig_514ba0480626 from signals

id sig_514ba0480626
event_id evt_e7744b13c87c
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-14T19:20:35.608958+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:b0921519f2e0b99f
throttle_s 0
created_at 2026-04-14T19:20:35.608958+00:00
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