Delete row sig_343e0de9275f from signals

id sig_343e0de9275f
event_id evt_962f81a7dd37
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T23:14:35.497804+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:dabcd4a51d8a21b2
throttle_s 0
created_at 2026-04-08T23:14:35.497804+00:00
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