Delete row sig_8168c215962e from signals

id sig_8168c215962e
event_id evt_b3672f8495bc
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-17T18:12:14.924596+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:224dc0bc7be0daf4
throttle_s 0
created_at 2026-04-17T18:12:14.924596+00:00
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