Delete row sig_6255fa3780c7 from signals

id sig_6255fa3780c7
event_id evt_e8ef4af33888
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T09:22:16.768912+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:fd1b25b85eeff4da
throttle_s 0
created_at 2026-04-22T09:22:16.768912+00:00
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