Delete row sig_d7ba394a69e7 from signals

id sig_d7ba394a69e7
event_id evt_c3966608bca8
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-17T07:14:22.789267+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d41f68830e7870d8
throttle_s 0
created_at 2026-04-17T07:14:22.789267+00:00
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