Delete row sig_0968180be1c4 from signals

id sig_0968180be1c4
event_id evt_a104396c4af2
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-16T02:30:07.434034+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:32dc65e8e04b11ac
throttle_s 0
created_at 2026-04-16T02:30:07.434034+00:00
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