Delete row sig_d316a3d406b0 from signals

id sig_d316a3d406b0
event_id evt_82a5846f479c
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-16T07:45:12.416936+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f581037d8b37d4d1
throttle_s 0
created_at 2026-04-16T07:45:12.416936+00:00
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