Delete row sig_b341f2974367 from signals

id sig_b341f2974367
event_id evt_2d5e2115d28c
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T14:47:09.221630+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:4b394f0bbb33d4f3
throttle_s 0
created_at 2026-04-09T14:47:09.221630+00:00
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