Delete row sig_3915208cba82 from signals

id sig_3915208cba82
event_id evt_23a41d6e4477
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T05:18:06.482483+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:bcdb77f9a98550fa
throttle_s 0
created_at 2026-04-20T05:18:06.482483+00:00
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