Delete row sig_546e751203d9 from signals

id sig_546e751203d9
event_id evt_db00394bcebe
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-16T10:33:48.738767+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:06165a3da0fac551
throttle_s 0
created_at 2026-04-16T10:33:48.738767+00:00
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