Delete row sig_14949268314d from signals

id sig_14949268314d
event_id evt_623590194894
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T14:47:16.305636+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:bc787ad329c095de
throttle_s 0
created_at 2026-04-11T14:47:16.305636+00:00
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