Delete row sig_41d7c39410ac from signals

id sig_41d7c39410ac
event_id evt_64aa461f6c76
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T17:00:41.388640+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:110394434a1f00e6
throttle_s 0
created_at 2026-04-10T17:00:41.388640+00:00
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