Delete row sig_2546e4c0de02 from signals

id sig_2546e4c0de02
event_id evt_471b56108936
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T12:39:00.023501+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d5b832b3d2b20bd0
throttle_s 0
created_at 2026-04-11T12:39:00.023501+00:00
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