Delete row sig_9a49f430c4ef from signals

id sig_9a49f430c4ef
event_id evt_2459b26646d9
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T08:06:45.873739+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d28f8aff59b689bb
throttle_s 0
created_at 2026-04-18T08:06:45.873739+00:00
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